Departments Department of Applied Ecology and Animal Hygiene Prof. Georgi Stefanov Petkov, DSc

Prof. Georgi Stefanov Petkov, DSc

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Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University,
6000 Stara Zagora, Bulgaria
Bulgarian
08.10.1951
Office phone: +359 42 699 488;  Mobile: +359 889 620 577

 Present rank or title

Professor, Ph.D., D.Sc.

               Education and training

 

June 9, 2006

D.Sc. in Ecology and Ecosystems Protection (Agroecology).
Thesis title: “Impact of Pig Farms as Anthropogenic Ecosystems on the Environment”,
Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

          April 15, 1974 – June 30,1977

Ph.D. in Animal Hygiene (Housing of Animals).
Thesis title: “Microclimate in Dairy Farms and its Dependence from the Climatic Conditions in Different Regions of Blagoevgrad District”,
Central Veterinary Research Institute (Now National Diagnostic Research Veterinary Medical Institute "Prof. Dr. G. Pavlov"), Sofia, Bulgaria.

September 15, 1969 – March 2,1974

M.Sc. in Zooengineering,
Thesis title: “Zoohygienic Assessment of Microclimate in Barns for Fattening Calves with Different Design and Ventilation System”,
Faculty of Zootechnics, Higher Institute of Agriculture, Sofia, Bulgaria.

Short time Specializations

 

March 1 – 15, 1999

Specialization in Livestock Ecology – educational and scientific programs and practices.
Department of Livestock Ecology, Faculty of Agriculture, Karl Liebig University, Giessen, Germany.

March 1 – 7, 1997

Specialization in Farm Management – educational and scientific programs and practices.
Faculty of Agriculture, University of Thessaly, Volos, Greece.

September 17 – October 1, 1994

Specialization in Animal hygiene and Food safety – educational programs and practices.
Department of Animal Hygiene and Food Safety, College of Veterinary Medicine,
University of Minnesota, USA.

Work Experience

 

2016 – present

Visiting Professor in Ecology and Ecosystems Protection,
Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University,
Stara Zagora, Bulgaria and
Editor-in-Chief of Agricultural Science and Technology – Scientific journal Published by Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2007 – 2016

Professor in Ecology and Ecosystems Protection,
Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University,
Stara Zagora, Bulgaria.

1988 – 2007

Associate Professor in Animal Hygiene (Housing of Animals), Department of Animal Hygiene, Faculty of Agriculture, Higher Institute of Zooengineering and Veterinary Medicine (up to 1995) / Trakia University (since 1995), Stara Zagora, Bulgaria.

1979 – 1988

Assistant Professor in Animal Hygiene (Housing of Animals), Department of Animal Hygiene, Faculty of Zooengineering, Higher Institute of Zooengineering and Veterinary Medicine, Stara Zagora, Bulgaria

2004 – 2016

Head of the Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
1996 – 2000 and 1988 – 1992
Vice Dean of the Faculty of Agriculture – Education activities
1996 – 1997
Vice Dean of the Faculty of Agriculture – Research activities

Expert

 

1999 – 2003

National Evaluation and Accreditation Agency, Sofia (Certificate No 0562/19.04.1999).

1997 – present

Ministry of Environment and Water, Expert on Environmental Impact Assessments Implementation, in the fields – Flora and Fauna (License No 667/28.07.1997, Certificate No 667/20.06.2002).

Teaching responsibilities

 

B.Sc. degree students

*Discipline Code in the Curriculum

010118* Animal Hygiene (Housing of Animals), (1988-1999)
010357 Disaster Protection and First Aid (1998 – 2015)
010321 Air Pollution and Impact on Ecosystems (1997 – present)
010332 Ecological Legislation and Regulations (1998 – present)

M.Sc. degree students

0102104 Legislation and Institutions in Organic Farming (2005 – present)
0102116 Organic Production of Animal Products (2005 – present)
0101215 Consulting Practices for Adapting Agriculture to Climate Changes (2015 – present)
0103129 Pollution and Environmental Protection in Urban Systems (2019 – present)

Textbooks and manuals for exercises

 

Textbooks:

  1. Petkov, G., G. Kostadinova, Sv. Dimitrova, Yu. Mitev, Ch. Miteva, A. Iliev (2009). Disaster Protection and First Aid, 1st Edition, Trakia University Academic Publishing House, Stara Zagora, ISBN 978-954-938-338-008-4, 117 pages.
  2. Petkov, G., G. Kostadinova (2008). Air Pollution and Impact on the Ecosystems, 2nd Edition, Trakia University, Stara Zagora, CONTRAST Publishing House, ISBN 978-954-9383-54-6, 236 pages.
  3. Petkov, G. (2001). Air Pollution and Impact on Ecosystems, 1st Edition, Trakia University, Stara Zagora, KOTA Publishing House, ISBN 954-9584-48-8, 286 pages.
  4. Netsov, N., G. Petkov (1994). Animal Hygiene (Housing of Animals), 1st Edition, Zemizdat State Publishing House, Sofia, ISBN 954-05-0256-Х, 339 pages.

Guides / Manuals for exercises:

  1. Iliev, A., Ch. Miteva, G. Petkov, G. Kostadinova (2008). Guide for Exercises in Animal Hygiene, Iskra MI Publishing House, Stara Zagora, ISBN 978 954-9383-38-6, 213 pages.
  2. Iliev, A., Yu. Mitev, Ch. Miteva, A. Chakarov, E. Yulenhop, N. Hardwing, D. Kanili, G. Petkov, K. Kirov, V. Barakova, D. Dimanov, B. Bivolarski , G. Kostadinova (2006). Animals in Disaster – Guide for students, Trakia University – Iowa State University, CONTRAST Publishing House, Stara Zagora, 130 pages.
  3. Iliev, A., G. Petkov, Ch. Miteva, G. Kostadinova (2005). Guide for Exercises in Animal Hygiene, CONTRAST Publishing House, Stara Zagora, ISBN 954-9383-05-9.
  4. Iliev, A., G. Petkov, C. Miteva, G. Kostadinova (2002). Disinfection, Disinsection and Deratization in the Livestock Farms. In.: Guide for Practical Training In Animal Health (Eds. D. Dimanov and T. Penev), Stara Zagora, ISBN 954-9887-34-0.
  5. Petkov, G., A. Iliev, G. Kostadinova (1999). Guide for Exercises in Animal Hygiene, 1st Edition, Universe Publishing House, Stara Zagora, ISBN 954-9887-03-0, 173 pages.
  6. Netsov, N., G. Petkov, A. Iliev (1991). Guide for Exercises in Animal Hygiene, 1st Edition, Zemizdat State Publishing House, Sofia, Code 95346 26332 / 4805-208-91, 162 pages.

7.   Petkov, G., A. Iliev (1987). Guide for Exercises in Animal Hygiene, 1st Edition, Zemizdat State Publishing House, Sofia, 200 pages.

Post Graduate Students Supervisor

 

2015

Adelina Gencheva, Ph.D. in Ecology and Ecosystems Protection (Improving the energy efficacy in a poultry farm for eggs production), completed 2015 (currently Deputy manager of a Private Business Company, Sofia).

2013

Greta Mihaylova, Ph.D. in Ecology and Ecosystems Protection, completed 2013 (currently Head of the Regional Laboratory-Stara Zagora at the Executive Environment Agency, Sofia).

2005

 

 

Rodne Nastova-Georgioska, Ph.D. in Ecology and Ecosystems Protection (The fish species in Vardar River as indicators for the water heavy metal pollution), completed 2005 (currently Professor and Director of the Institute of Animal Science, Skopje, Republic of Northern Macedonia).

Member of Scientific Juries and Reviewer

 

Ph.D. Degree Thesis:

 

2019

Borislava Todordva, in Ecology and Ecosystems Protection (Ecological and social aspects in the management of some types of waste), Faculty of Biology, University “Paisius of Hilendar”, Plovdiv, Bulgaria.

2019

Vasil Vasilev, in Reduction of greenhouse gas emissions from cattle, sheep and poultry manure, Agricultural Institute, Stara Zagora, Bulgaria.

2017

Dimo Dimov, in Animal Hygiene (Microclimate – technological parameters – comfort indices at free-stall rearing of dairy cows), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2017

Evgeni Videv, in Reduction of greenhouse gas emissions from ruminants through appropriate nutrition and additives, Agricultural Institute, Stara Zagora, Bulgaria.

2017

Evgenia Kostadinova, in Ecology and Ecosystems Protection (Biodiversity in apple agrocenosis in the conditions of organic farming), Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2017

Maria Chunchukova, in Ecology and Ecosystems Protection (Parasites and parasitic communities in fish from Danube River), Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2015

Adelina Gencheva, in Ecology and Ecosystems Protection, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2015

Doychin Terziiski, in Fish farming, fisheries and industrial fishing, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2015

Georgi Lechov, in Ecology and Ecosystems Protection (Application of remote observation method to determine the development of the vegetation in Rhodope mountain), Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2014

Nikolai Takuchev, in Ecology and Ecosystems Protection (Influence of the climate and relief on the behavior and migration of air pollutants in the region of Stara Zagora), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2013

Stefan Hristov, in Ecology and Ecosystems Protection (Heavy metals circulation in the freshwater ecosystem of “Srebarna” Biosphere Reserve), Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2013

Toncho Penev, in Animal Hygiene (Influence of zoohygienic and technological factors on lameness, in relation to the milk production and the reproduction dairy cows),
Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2012

Veselin Kirov, in Animal Hygiene (Zoohygienic and ecological factors affected milk organic production), Faculty of Veterinary Medicine, University of Forestry, Sofia, Bulgaria.

2012

Rositsa Stefanova, in Ecology and Ecosystems Protection (Environmental pollution from poultry production systems), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2006

 

Konstantin Tyufekchiev, in Ecology and Ecosystems Protection (Effect of OVOCAP on biological parameters and ecological plasticity in pheasants and laying hens), Faculty of Mathematics and Natural Sciences, Southwestern University “Neofit Rilski”, Blagoevgrad, Bulgaria.

D.Sc. Degree Thesis:

 

2013

Ivanka Zhelyazkova, in Ecology and Ecosystems Protection (Bees and bee products as indicators of environmental pollution), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2012

Nedyalka Georgieva, in Ecology and Ecosystems Protection (Ecological assessment of surface and ground water), Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria.

2011

Atanas Ilchev, in Animal Nutrition (Influence of some nutritional factors, age and genotype of animals on the retention and excretion of N, Ca and P in growing and fattening pigs),
Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2008

Stefan Denev, in Ecology and Ecosystems Protection (Ecological alternatives to antibiotic growth stimulants in animal husbandry and aquaculture), Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

Associated Professors:

 

2017

Galin Nikolov, in Fish farming, fisheries and industrial fishing, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2016

Veselin Kirov, in Animal Hygiene (Housing of Animals), Faculty of Veterinary Medicine, University of Forestry, Sofia, Bulgaria.

2016

Toncho Penev, in Animal Hygiene (Animal Health), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2016

Nikolai Takuchev, in Ecology and Ecosystems Protection, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2015

Veselka Vlahova, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2015

Ekaterina Valcheva, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2015

Katya Velichkova, in Ecology and Ecosystems Protection, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2015

Tatiana Bileva, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2015

Sonya Uzunova, in Ecology and Ecosystems Protection, Institute of Fish Resources,
Varna, Bulgaria.

2014

Valentin Doychev, in Pig breeding, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2014

Nadia Bozakova, in Animal Hygiene, Ethology and Animal Protection, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria.

2013

Penka Zapryanova-Aleksieva, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria.

2013

Veselina Mihneva, in Ecology and Ecosystems Protection, Institute of Fish Resources,Varna, Bulgaria.

2011

Diyan Georgiev, in Ecology and Ecosystems Protection, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2008

Krassimir Krastev, in Ecology and Ecosystems Protection, Institute of Animal Science, Kostinbrod, Bulgaria.

2000

Gurga Mihaylova, in Ecology and Ecosystems Protection, Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

Professors:

 

2015

Diana Kirin, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria. 

2015

Ivanka Zhelyazkova, in Special Animal Branches (Bees), Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2015

Daniela Georgieva-Klisarova, in Ecology and Ecosystems Protection,
Institute of Fish Resources, Varna, Bulgaria.

2014

Vladislav Popov, in Ecology and Ecosystems Protection, Faculty of Plant Protection and Agroecology, Agricultural University, Plovdiv, Bulgaria. 

2013

Tanya Hubenova, in Fish Farming, Fisheries and Industrial Fishing,
Institute of Fisheries and Aquaculture, Plovdiv, Bulgaria. 

2013

Chonka Miteva, in Animal Hygiene (Housing of Animals), Faculty of Agriculture,
Trakia University, Stara Zagora, Bulgaria.

2012

Yurii Mitev, in Animal Hygiene and Organization of Veterinary Services (Animal Health), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

2011

Valentin Katsarov, in Pig Breeding, Faculty of Agriculture, Trakia University,
Stara Zagora, Bulgaria.

2007

Dimitar Dinev, in Animal Hygiene (Buildings and Technologies in Animal Husbandry), Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.

Other skills and competences

 

Editor/Editorial Board:

 

Journal of Balkan Ecology (2005 – present)
Ecology and Future (2005 – 2018)
Agricultural Science and Technology (2008 – 2016; Editor-in-Chief, 2016 – present)

Ad Hoc Reviewer:

Agricultural Science and Technology
Bulgarian Journal of Veterinary Medicine
Macedonian Journal of Animal Science
The Scientific World Journal
Fresenius Environmental Bulletin
Environmental Monitoring and Assessment
Ecologia Balcanica

Professional and Scholarly Organizations:

  • Union of Scientists in Bulgaria, Stara Zagora Branch (1981 – present)
  • Faculty Council at Faculty of Agriculture, Trakia University (1990 – 2016)
  • Academic Council at Trakia University (1999 – 2015)
  • Scientific Council of the Institute of Fisheries and Aquaculture-Plovdiv and the Institute of Fish Resources-Varna (2008 – 2013)
  • Deputy President of the Scientific Council on Farming Systems and Animal Production at the Higher Attestation Commission of the Council of Ministers of the Republic of Bulgaria (2005 – 2009)
  • National Scientific Council on Livestock Farming at the Higher Attestation Commission of the Council of Ministers of the Republic of Bulgaria (2000 – 2004)
  • International Society for Animal Hygiene (ISAH) (1985 – 1997)

Work on scientific projects:

1. Project 1E/14: "Water Quality Assessment Used for Drinking Purposes of Cattle and Sheep ", Funded by the Ministry of Education through the Faculty of Agriculture, Trakia University, Project participant (2014 – 2015).

2. Project 1E/09: “Ecological Status Assessment of a Farm for 50 sows”, Funded by the Ministry of Education through the Faculty of Agriculture, Trakia University, Project manager (2009 – 2010).

3. Project: “Assessment, Reduction and Prevention of Air, Water, Soil And Plant Pollution in Stara Zagora Region”, Ref. No 2008/115236, financed by the Norway Grants and the Norwegian Cooperation Programme with Bulgaria – Innovation Norway, Project coordinator/contractor (2009 – 2011, €637000).

4. Project IV.E.1.: “Ecological Assessment of Livestock Production Systems”, Funded by the Ministry of Education through the Faculty of Agriculture, Trakia University, Project manager (1999 – 2001).

5. Personal Project: Thempus Phare IMG97-BG-1014 “Curriculum Development in Sustainable Farming System for Bulgaria”. Implemented in Karl Liebig University, Giessen, Germany (March 1999).

6. Phare-ACE Project P96-6118-R: “Energy and Environmental – Multiregulation on the National and International Levels”, Partisipants: Germany, Poland, England, Lithuania and Bulgaria, Project contractor for Bulgaria (1997-1999).

Participation to International

Scientific Forums:

  • International Symposium of Livestock Production, September 14-16, 2017, Skopje, Republic of Macedonia
  • 12th International Conference on the Mediterranean Coastal Environment, MEDCOAST 2015, October 6-10, 2015, Golden Sands, Varna, Bulgaria.
  • International Conference “Ecology – Interdisciplinary Science and Practice”, October 25-26, 2012, Sofia, Bulgaria.
  • IVth International Symposium of Livestock Production, September 9-12, 2009, Struga, Republic of Macedonia.
  • IVth Balkan Conference on Animal Science “BALNIMALCON – 2009” – “Challenges of the Balkan Animal Industry and the Role of Science and Cooperation”, May 14-16, 2009, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
  • National Scientific Conference with International Participation: "Sustainable Agrarian Development of Bulgaria in the European Union", May 6-9, 2008, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
  • Seminar "Disaster Preparedness in Agricultural Sector", January 24-25, 2007, Trakia University – Iowa State University, Stara Zagora, Bulgaria.
  • National Scientific Conference with International Participation "European Integration and Development of Rural Areas", May 3-5, 2007, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
  • Seminar "Good Farming Practices and Environmental Protection", May 28-30, 2006, Trakia University – Iowa State University, Stara Zagora, Bulgaria.
  • National Scientific Conference with International Participation “Ecology, Agricultural Production, Sustainable Development”, May 4-5, 2004, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
  • XIII International Symposium „Ecology – 2004“, June 2-6, 2004, Union of Scientists in Bulgaria, Sunny Beach, Bulgaria.
  • National Scientific-Practical Conference with International Participation “Problems of Livestock Production in Bulgaria”, May 22-23, 2002, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria.
  • National Scientific-Practical Conference with International Participation "Man, Nature, Health", November 3-4, 2000, Pamporovo, Bulgaria.
  • International Conference “Livestock and the Environment – Finding a Balance”, June 16-20, 1997, Ede/Wageningen, the Netherlands.
  • Second International Symposium "Ecology – Sustainable Development", October 1-4, 1997, Union of Scientists in Bulgaria, Vratsa, Bulgaria.
  • 9th International Congress in Animal Hygiene, August 17-21, 1997, Helsinki, Finland.
  • 6th European Symposium on the Quality of Eggs and Egg Products, September 25-29, 1995, Saragossa, Spain.
  • International Scientific Conference "Environmental Issues and Forecasts in Agriculture", November 22-24, 1995, Bulgarian Academy of Sciences, Vratsa, Bulgaria.
  • 9th European Poultry Conference, Glasgow, August 7-12, 1994, UK.
  • 8th International Congress on Animal Hygiene, University of Minnesota, September 12-16, 1994, St. Paul, Minnesota, USA.
  • 7th International Congress on Animal Hygiene, August 20-24, 1991, Leipzig, Germany.
  • 4th European Symposium on the Quality of Eggs and Egg Products, May 12-17, 1991, Doorverth, the Netherlands.
  • 6th International Symposium of Young Poultry Scientists, September 4-6, 1991, Wroclaw, Poland.
  • National Conference with International Participation: "Microcomputers and Microprocessor Systems in the Production and Processing of Animal Products", March 28-29, 1991, Union of Scientists in Bulgaria, Vratsa, Bulgaria.
  • 7th Scientific-Methodical Seminar "Improvement of Higher Agricultural Education", December 18-22, 1990, Ukrainian Agricultural Academy, Kiev, Ukraine.
  • Scientific and Technical Conference with International Participation: "Interaction Genotype-Environment in Poultry Farming", October 1-2, 1990, International House of Scientists “Fr. J. Curie”, Union of Scientists in Bulgaria, Varna, Bulgaria.
  • International Scientific Conference, Humboldt University, December 7-8, 1988, Berlin, Germany.
  • 6th International Congress on Animal Hygiene, June14-17, 1988, Skara, Sweden.
  • 4th International Symposium of Young Poultry Scientists, June 7-9, 1988, Krakow, Poland.
  • XIII Republican Symposium of Young Researchers and Specialists in Agriculture and Food Industry, June 2-6, 1987, Ministry of Agriculture – Agricultural Academy, Kazanluk, Bulgaria.
  • 5th International Congress on Animal Hygiene, September 10-13, 1985, Hannover, FRG.
  • Second Symposium on the Application of Polymers in Agriculture, Forestry and Food Industry, October 1-5, 1985, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria.
  • 17th World’s Poultry Congress, August 8-12, 1984, Helsinki, Finland.
  • Second Scientific Symposium on Greening of Technologies in Industrial Animal Husbandry, November 15-16, 1983, Union of Scientists in Bulgaria, Vidin, Bulgaria.
  • Symposium with International Participation: “The Role of Polymers for Intensification of Agriculture and Forestry”, May 5-7, 1982, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria.
  • 4th International Congress of Animal Hygiene, September 20-25, 1982, High Tatras, Czechoslovakia.
  • XI Republican Symposium of Young Researchers and Specialists in Agriculture and Food Industry, December 9-11, 1981, Ministry of Agriculture – Agricultural Academy, Kazanluk, Bulgaria.

Additional information

 

     Web of Science and Scopus publications, 38 citations, h-index 3:

  1. Dermendzhieva D.M., Zhelyazkov G.I., Beev G.G., Kostadinova G.S., Dinev T.G., Petkov G.S. (2019). Agro-Еcological Assessment of Ovcharitsa Dam (Bulgaria) Water Used for Thermal Power Plant Cooling. ECOLOGIA BALKANICA, 11(2): 167-180.
  2. Kostadinova, G, D. Dermendzhieva, G. Petkov, G. Beev, K. Koev (2018). Evaluation of wastewater quality at the inlet-outlet of the most modern wastewater treatment plant in Bulgaria. Fresenius Environmental Bulletin, 27(12B): 9723-9738.
  3. Dermendzhieva, D, G. Kostadinova, G. Petkov, R. Nastova, I. Dineva (2018). Agro-ecological assessment of Sokolitsa River water affected by open coal mining activity in the largest energy complex in Bulgaria. Bulgarian Journal of Agricultural Science, Vol. 24 (Supplement 1), 169-179.
  4. Kostadinova, G., D. Dermendzhieva, G. Beev, G. Petkov, D. Pavlov, E. Valkova (2017). Quality assessment of Maritsa River water as a main source for irrigation in Thracian Valley. Fresenius Environmental Bulletin, 26(7): 4367-4374.
  5. Valkova, E., V. Atanasov, K. Velichkova, G. Kostadinova, G. Petkov (2015). Content of Cd in water, sediment, aquatic plants and musculature of Carp from surface waterbodies in Stara Zagora region, Bulgaria. Bulgarian Journal of Agricultural Science, Vol. 21, (Supplement 1), 190-195.
  6. Dobreva, Z., G. Kostadinova, B. Popov, G. Petkov, S. Stanilova (2015). Proinflammatory and anti-inflammatory cytokines in adolescents from Southeast Bulgarian cities with different levels of air pollution. Toxicology and Industrial health, 31(12): 1210-1217.
  7. Klisarova, D., D. Gerdzhikov, G. Kostadinova, G. Petkov (2015). Investigation of phytoplankton in the Varna bay (2005-2014). In: Proceeding of the 12th International Conference on the Mediterranean Coastal Environment, MEDCOAST 2015, October 6-10, 2015, Golden Sands, Varna, Bulgaria, Vol. 1, pp. 299-308, Code 117490.
  8. Kostadinova, G., G. Petkov, S. Denev, Ch. Miteva, R. Stefanova, T. Penev (2014). Microbial pollution of manure, litter, air and soil in a poultry farm. Bulgarian Journal of Agricultural Science, 20(1): 66-75.
  9. Kostadinova, G.N. Georgieva, Z. Yaneva, G. Petkov, M. Todorova, Ch. Miteva (2013). Tundzha River water quality as a source for irrigation in agriculture. Bulgarian Journal of Agricultural Science, 19(4): 635-643.
  10. Petkov, G., G. Kostadinova, S. Denev, G. Mihailova, D. Pavlov (2006). Microbial pollution of soil around slurry storage lagoons at a pig-farm. Applied Soil Ecology, 34(1): 10-18.

Referred publications in journals, published in English:

  1. Dermendzhieva, D, G. Kostadinova, G. Petkov, T. Dinev, V. Vasilev (2017). Hygienic and ecological assessment of the microclimate in a farm for intensive breeding of rabbits. Macedonian Journal of Animal Science, 7(1-2): 97-105.
  2. Dermendzhieva, D., G. Kostadinova, G. Petkov, D. Dimov, T. Dinev, T. Penev, Tch. Miteva, J. Mitev (2017). Agro-ecological assessment of manure from different farm animals by content of biogenic elements. Agricultural Science and Technology, 9(1): 53-61.
  3. Kostadinova, G., D. Dermendzhieva, G. Petkov, I. Taneva (2015). Agroecological assessment of wastewater from Municipal Wastewater Treatment Plant by physico-chemical parameters. Agricultural Science and Technology, 7(2): 242-247.
  4. Kostadinova, G., D. Dermendjieva, G. Petkov, J. Gotchev (2014). Agroecological assessment of wastewater and sludge from Municipal Wastewater Treatment Plant by content nutrient inputs. Agricultural Science and Technology, 6(3): 325-332.
  5. Atanasov, V., E. Valkova, G. Kostadinova, G. Petkov, Ts. Yablanski, P. Valkova, D. Dermendjieva (2013). Mn levels in water, sediment and algae from waterbodies with high anthropogenic impact. Agricultural Science and Technology, 5(2): 206-211.
  6. Dobreva, Z, G. Kostadinova, G. Petkov, S. Stanilova, B. Popov (2012). Determination of IgG, IgA and IgM immune complexes in plasma of adolescents from cities of Stara Zagora region with different level of air pollution. Trakia Journal of Science, Vol. X, (Supplement), 195-202.
  7. Atanasov, V., E. Valkova, G. Kostadinova, G. Petkov, N. Georgieva, Ts. Yablanski, G. Nikolov (2012). Study on levels of some heavy metals in water and liver of carp (Cyprinus carpio L.) from waterbodies in Stara Zagora region, Bulgaria. Agricultural Science and Technology, 4(3): 321-327.
  8. Mihaylova, Gr., G. Kostadinova, G. Petkov (2012). Assessment of the physical-chemical status of surface water in lower part of Toundja River, Bulgaria. Agricultural Science and Technology, 4(3): 277-284.
  9. Petkov, G., G. Kostadinova, R. Stеfanova, T. Penev, P. Gercheva (2010). Animal hygiene and ecological assessment of air pollution in a pig-farm. Agricultural Science and Technology, 2(3): 143-152.
  10. Kostadinova, G., G. Petkov, V. Barakova (2009). Investigation on the Waste Water Management Units on Pig Farm. Krmiva, Zagreb, 5, 279-285.
  11. Denev, S.A., G.S. Petkov, G.S. Mihailova, I. Suzuki (2006). Strategies of Animal Nutrition Decreasing the Environmental Emission and Pollution. Journal of Balkan Ecology, 9(1): 5-44.
  12. Petkov, G., G. Kostadinova, G. Mihailova, A. Ilchev, D. Pavlov (2006). Nitrogen, Phosphorus and Potassium Balances in Finishing Pigs as Indicators for Ecological Assessment of Farm. Journal of Balkan Ecology, 9(1): 97-107.
  13. Mihaylova, G., G. Gerchev, G. Petkov, M. Grozeva (2005). Mineral Concentration Dynamics in Milk during the Lactation Period of Tsigay Sheep. Ecology and Future, 4(2): 40-43.

 14. Petkov, G., G. Kostadinova, V. Barakova (2004). Ecological Assessment of Soil Located around Pig Slurry Storage Lagoons. Journal of Balkan Ecology, 7(4): 428-433.

Referred publications in journals, published in Bulgarian with abstracts in English:

  1. Kostadinova, G., D. Dermendzhieva, G. Petkov, R. Stefanova (2015). Agroecological assessment of turkey manure and litter. Journal of Animal Science, vol. 52(6): 46-53.
  2. Petkov, G., Ts. Yablanski, M. Todorova, D. Pavlov, G. Kostadinova, V. Barakova (2010). Ecological assessment of soils from parks and other areas in Stara Zagora town. Ecology and Future, 9(4): 24-31.
  3. Kostadinova, G., G. Petkov, V. Barakova (2007). Wastewater treatment efficiency in municipal wastewater treatment plant of Kazanlak town. Ecology and Future, 6(1): 43-50.
  4. Kostadinova, G., G. Petkov, V. Barakova (2007). Application of ecological environmental impact assessments in animal husbandry. Journal of Animal Science, 44(3): 65-71.
  5. Kostadinova, G., G. Petkov (2007). Dependencies between some productive and abiotic parameters in rearing of laying hens in cages. Journal of Animal Science, 44(1): 38-44.
  6. Kostadinova, G., G. Petkov, V. Barakova, K. Angelova (2006). Ecological assessment of the anthropogenic impacts on the waters in the Yantra River basin. Ecology and Future, 5(4): 51-59.
  7. Petkov, G. (2006). Ecological assessment of microbial soil pollution in a pig farm. Ecology and Future, 5(1): 36-41.
  8. Nastova-Giorgioska, R., G. Kostadinova, G. Petkov (2006). Accumulation of heavy metals in the ecotrophorolytic chain of Barbus Meridionalis Risso (Black Barbel) from Vardar River, Republic of Macedonia. Ecology and Future, 5(1): 28-35.
  9. Petkov, G. (2005). Hygienic assessment of the air pollution in a pig farm at different hours of the day. Journal of Animal Science, 42(4): 104-110.
  10. Petkov, G. (2004). Air pollution from a pig farm for 4530 pigs. Journal of Animal Science, 41(4): 74-79.
  11. Petkov, G. (2004). Method for complex ecological assessment of livestock farms. Journal of Animal Science, 41(4): 70-73.
  12. Kostadinova, G., G. Petkov, G. Mikhailova, S. Denev (2004). Microbial contamination of the soil around manure storage sites in dairy farms. Journal of Animal Science, 41(1): 58-62.
  13. Petkov, G., G. Kostadinova, G. Mikhailova, St. Denev (2004). Drinking water quality in a pig farm for 4530 pigs. Ecology and Future, 3(2): 10-16.
  14. Kostadinova, G., G. Petkov, G. Mikhailova, S. Denev (2003). Drinking water quality in dairy farms. Ecology and Future, 2(3): 25-30.
  15. Kostadinova, G., G. Petkov (2003). The Netherlands experience to create organic pig farming and opportunities for its application in Bulgaria. Ecology and Future, 2(1): 91-96.
  16. Petkov, G., G. Kostadinova, V. Barakova (2002). Procedures for environmental impact assessment in animal husbandry. Journal of Animal Science, 39(4-5): 149-153.
  17. Tyankov, S., G. Petkov, G. Mikhailova (2001). Livestock ecological problems and possibilities for their solution. Journal of Mountain Agriculture on the Balkans, 4(1): 31-39.
  18. Barakova, V., G. Petkov, G. Kostadinova (2001). Assessment of Stara Zagora air pollution based on data from environmental monitoring. Journal of Animal Science, 37(2): 187-190.
  19. Petkov, G., G. Kostadinova, V. Barakova (2001). Ecological efficiency of a system for cleaning, processing and storage of manure from a farm for 500 pigs. Journal of Animal Science, 38(2): 183-186.
  20. Kostadinova, G., G. Petkov, V. Barakova (2001). Indicators characterizing the interaction between animal farms and the environment. Journal of Animal Science, 38(2): 164-168.
  21. Atanasov, V., J. Staykov, Yu. Mitev, G. Petkov, D. Dimanov, Ch. Miteva (1999). Bioenergy aspects of the embryonic development of Salmo Truta M. Fario L. as an indicator of the water purity in the region of Stara Zagora. Journal of Mountain Agricultureon the Balkans, 2(2): 126-135.
  22. Petkov, G., G. Kostadinova (1997). Thermal-technical characteristics of the buildings in poultry farms for egg production. Journal of Animal Science (Suplement), 287-290.
  23. Petkov, G. (1997). Gas-energy exchange of the broiler chickens reared in the conditions of optimal microclimate. Journal of Animal Science (Suplement), 284-286.
  24. Iliev, A., G. Petkov, L. Yordanova, V. Katsarov (1995). Optimization of the heat balance and ventilation in livestock buildings. Agricultural Science and Production, 33(6); 30-32.
  25. Petkov, G., A. Iliev, V. Katsarov, L. Yordanova (1995). Algorithm for determining the body's heat exchange in pigs depending on environmental conditions. Agricultural Science and Production, 33(2-3): 24-26.
  26. Nenchev, P., G. Petkov (1988). Influence of some environmental factors on gas exchange and heat production in the honey bee. Journal of Animal Science, 25(4): 85-88.
  1. Petkov, G., P. Nenchev (1988). Method for determination of gas exchange and heat production in bees. Journal of Animal Science, 25(3): 82-84.
  2. Petkov, G., G. Boychev, M. Kabakchiev (1987). Determination of the heat loss of broiler chickens depending on the environmental conditions by microcomputer programme. Journal of Animal Science, 24(8): 56-61.
  3. Iliev, A., G. Petkov, D. Dimanov (1983). Study on the influence of some microclimatic parameters on the growth of early-weaned pigs. Journal of Animal Science, 20(1): 59-65.
  4. Ovesenska, L., G. Petkov, M. Panayotov (1983). Gas exchange in the silkworm. Nature, Bulgarian Academy of Science, Sofia, 69-73.
  5. Petkov, G., A. Iliev, D. Dimanov (1981). Gas-energy exchange in tied breeding of calves from one to four months of age. Journal of Animal Science, 18(7): 122-125.
  6. Petkov, G. (1977). Air temperature and milk productivity of dairy cows. Veterinary Collection, 5, 23-25.

    Proceedings:

  1. Kostadinova, G., G. Petkov (2012). Sustainable development of agroecosystems and environmental protection in Bulgaria. International Conference Ecology – Interdisciplinary Science and Practice, October 25-26, Sofia, Part I, PublishScieSet-Eco-Publisher, pp. 310-317. ISBN: 978-954-749-096-3.
  2. Petkov, G., G. Kostadinova, V. Barakova, R. Stefanova (2009). Environmental pollution from dairy and pig farms in Bulgaria. IVth Balkan Conference on Animal Science “BALNIMALCON – 2009” – “Challenges of the Balkan Animal Industry and the Role of Science and Cooperation”, May 14-16, Trakia University, Faculty of Agriculture, Stara Zagora, Bulgaria, pp. 453-457.
  3. Petkov, G., V. Barakova, Yu. Mitev, G. Kostadinova (2008). Sustainable development of agroecosystems. National Scientific Conference with International Participation: "Sustainable Agrarian Development of Bulgaria in the European Union", May 6-9, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria, pp. 14-25 (Bg).
  4. Barakova, V., G. Kostadinova, G. Petkov, C. Miteva (2007). Environmental risk management in the agricultural sector. Seminar "Disaster Preparedness in Agricultural Sector", January 24-25, Trakia University – Iowa State University, Stara Zagora, Bulgaria, 2-8.
  5. Petkov, G., D. Dimanov (2007). The role of animal husbandry for rural development in the process of EU integration. National Scientific Conference with International Participation "European Integration and Development of Rural Areas", May 3-5, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria (Bg).
  6. Petkov, G., G. Kostadinova, V. Barakova (2007). Preparedness in case of technical accidents in the agricultural sector. Seminar "Disaster Preparedness in Agricultural Sector", January 24-25, Trakia University – Iowa State University, Stara Zagora, Bulgaria, 12-18.
  7. Iliev, A., Ch. Miteva, L. Timms, Y. Mitev, G. Petkov, J. Gergovska, G. Kostadinova (2006). Animal welfare according to the European Union requirements and the normative documents in Bulgaria. Seminar "Good Farming Practices and Environmental Protection", May 28-30, Trakia University – Iowa State University, Stara Zagora, Bulgaria, pp. 12-25.
  8. Petkov, G., A. Iliev, G. Kostadinova, Ch. Miteva, Yu. Mitev, J. Gergovska (2006). Hygienic requirements in the livestock farms. Seminar "Good Farming Practices and Environmental Protection", May 28-30, Trakia University – Iowa State University, Stara Zagora, Bulgaria, pp. 2-11.
  9. Stankov, I., G. Petkov et al. (2004). Environmentally friendly and sustainable development of agricultural production in Bulgaria. Plenary report of the National Scientific Conference with International Participation “Ecology, Agricultural Production, Sustainable Development”, May 4-5, 2004, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria, 96-101, 138-144, 184-198 (Bg).
  10. Petkov, G., G. Kostadinova, G. Mikhailova (2004). Ecological problems of animal husbandry in Bulgaria. XIII International Symposium „Ecology – 2004“, June 2-6, 2004, Union of Scientists in Bulgaria, Sunny Beach, Bulgaria, pp. 179-207. ISBN: 954-9368-04-1.
  11. Petkov, G. (2002). Greening of livestock production. In: Plenary report “Problems of livestock production in the Republic of Bulgaria” (Ed. I. Stankov). National Scientific-Practical Conference with International Participation “Problems of Livestock Production in Bulgaria”, May 22-23, 2002, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria, 74-79 (Bg).
  12. Tyankov, S., G. Petkov, G. Mikhailova, V. Kafedzhiev, G. Kostadinova (2000). Ecological aspects of animal husbandry. National scientific-practical conference with international participation "Man, Nature, Health", November 3-4, 2000, Pamporovo, Vol. I, Plovdiv University Publishing House "Paisius of Hilendar", pp. 29-33. ISBN: 954-423-218-4 (Bg with abstract in English).
  13. Petkov, G., G. Kostadinova, G. Zhelyazkov (1997). The policy of FAO, World Bank and Commission of the European Community for the environmentally sound development of animal husbandry in the world and the opportunities of Bulgaria in this direction. Second International Symposium "Ecology – Sustainable Development", October 1-4, Vratsa, Union of Scientists in Bulgaria – Vratsa Branch, Scientific Papers, pp. 167-175 (Bg).
  14. Petkov, G., A. Iliev, G. Kostadinova (1997). On some aspects of bioenergetics of a chicken broiler farm as an ecotechnical system. 9th International Congress in Animal Hygiene, August 17-21, Helsinki, Finland, Vol. 1, pp. 344-347.
  15. Petkov, G. (1995). Application in Bulgaria of the Western European engineering system for environmentally friendly utilization of the manure from livestock farms. International Scientific Conference "Environmental Issues and Forecasts in Agriculture", November 22-24, Bulgarian Academy of Sciences, Vratsa, Bulgaria, 212-221 (Bg).
  16. Petkov, G., D. Dimanov, M. Kabakchiev (1995). Quality of table eggs produced by laying hens reared in intensive system with cages-batteries equipment. 6th European Symposium on the Quality of Eggs and Egg Products, September 25-29, Saragossa, Spain, pp. 189-194.
  17. Dimanov, D., G. Petkov, S. Georgiev (1995). Effect of dietary fluoride upon the chemical and mineral content in meat and bones of chicken-broilers. 6th European Symposium on the Quality of Eggs and Egg Products, September 25-29, Saragossa, Spain, pp. 91-94.
  18. Dimanov, D., G. Petkov, S. Georgiev, J. Mitev (1994). Influence of selenium and ascorbic acid on the activity of plasma glutation peroxidase and peroxidase resistance of erythrocyte lipids in chickens. 9th European Poultry Conference, Glasgow, August 7-12, UK, pp. 183-184.
  19. Petkov, G., D. Dimanov, M. Kabakchiev, J. Mitev (1994). Microcomputer program for determination of heat exchange at laying hens according to the environment conditions. 9th European Poultry Conference, Glasgow, August 7-12, UK, pp. 153-154.
  20. Petkov, G., D. Dimanov, K. Kostov, S. Georgiev (1994). Correlation between some microclimatic and productive parameters at laying hens reared in cages. 9th European Poultry Conference, Glasgow, August 7-12, UK, pp. 131-132.
  21. Petkov, G., A. Iliev, V. Katsarov, V. Doichev (1994). Determination of heat losses and growth in weaned pigs in relation with environmental conditions. 8th International Congress on Animal Hygiene, September 12-16, St. Paul, Minnesota, USA, PO 112-115.
  22. Petkov, G., D. Dimanov, K. Kostov (1994). Microclimate and production characteristics of laying hens reared in cages-batteries in premises of different type. 8th International Congress on Animal Hygiene, September 12-16, St. Paul, Minnesota, USA, PO 89-91.
  23. Dimanov, D., G. Petkov, S. Georgiev, J. MItev (1994). Hygienic estimation on selenium status of ruminants in Bulgaria. 8th International Congress on Animal Hygiene, September 12-16, St. Paul, Minnesota, USA, HP 5-7.
  24. Petkov, G., M. Kabakchiev, K. Kostov (1991). Atmospheric dust and toxic gases in poultry buildings of different kind. 7th International Congress on Animal Hygiene, Leipzig, Germany, August 20-24, Vol. I, pp. 359-363. ISBN 3-924851-56-5.
  25. Dimanov, D., J. Stankov, V. Atanasov, G. Petkov, A. Iliev (1991). Hygiene evaluation of selenium and fluorine in the environment and in one-summer old caps (Cyprinus Caprio L.). 7th International Congress on Animal Hygiene, Leipzig, Germany, August 20-24, Vol. I, pp. 341-345. ISBN 3-924851-56-5.
  26. Dimanov, D., R. Slavov, G. Petkov, A. Iliev (1991). Hygiene estimation of selenium content in the organism of sheep. 7th International Congress on Animal Hygiene, Leipzig, Germany, August 20-24, Vol. I, pp. 331-334. ISBN 3-924851-56-5.
  27. Petkov, G., D. Alexieva, M. Kabakchiev (1991). Determination of heat loss and growth of broilers at different environmental conditions and diet energy costs. 7th International Congress on Animal Hygiene, Leipzig, Germany, August 20-24, Vol. I, pp. 304-308. ISBN 3-924851-56-5.
  28. Kabakchiev, M., G. Petkov, G. Zheliazkov (1991). Quality of eggs under an asymmetrical light pattern with secondary light period. 4th European Symposium on the Quality of Eggs and Egg Products, Doorverth, May 12-17, the Netherlands, pp. 39-41.
  29. Petkov, G., M. Kabakchiev (1990). Ecological and nature protection training of students in Zooengineering at the Higher Institute of Zooengineering and Veterinary Medicine, Stara Zagora, Bulgaria. 7th Scientific-Methodical Seminar "Improvement of Higher Agricultural Education", December 18-22, 1990, Ukrainian Agricultural Academy, Kiev, Ukraine, pp. 11-14.
  30. Kabakchiev, M., G. Petkov, G. Zhelyazkov, A. Antonov (1990). Interrupted light regime with secondary asymmetric photoperiod in the rearing of RA-4 hybrid laying hens. Scientific and Technical Conference with International Participation: "Interaction Genotype-Environment in Poultry Farming", October 1-2, 1990, International House of Scientists “Fr. J. Curie”, Union of Scientists in Bulgaria, Varna, Bulgaria, 250-257 (Bg with abstract in English).
  31. Petkov, G., G. Boychev, M. Kabakchiev (1988). The chick-broilers heat exchange as an indicator for environmental conditions assessment in poultry buildings. International Scientific Conference, Humboldt University, December 7-8, Berlin, Germany, pp. 209-214.
  32. Petkov, G., M. Kabakchiev, G. Boychev (1988). Microclimate and growth performance of broilers reared in buildings with different ventilation systems. 6th International Congress on Animal Hygiene, Skara, Sweden, June 14-17, Vol. I, pp. 368-371. ISSN 0283-0698; ISSN 91-576-3449-1.
  33. Petkov, G. (1987). Study on some biological parameters in lambs reared in different microclimatic conditions. XIII Republican Symposium of Young Researchers and Specialists from Agriculture and Food Industry, June 2-6, Ministry of Agriculture – Agricultural Academy, Kazanluk, Bulgaria, 462-470 (Bg).
  34. Kabakchiev, M., G. Petkov, S. Dimitrov (1985). Quality of eggs obtained from laying hens reared in a polymer building. Second Symposium on the Application of Polymers in Agriculture, Forestry and Food Industry, October 1-5, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria, 26-36 (Bg).
  35. Petrunova, D., G. Petkov, M. Kabakchiev (1985). Efficiency of polymer buildings for laying hens rearing. Second Symposium on the Application of Polymers in Agriculture, Forestry and Food Industry, October 1-5, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria, 19-25 (Bg).
  36. Petkov, G., M. Kabakchiev, S. Dimitrov (1985). Characteristics of the laying hens’ productivity rearing in a modern polymer building. Second Symposium on the Application of Polymers in Agriculture, Forestry and Food Industry, October 1-5, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria, 10-18 (Bg).
  37. Dimitrov, S., G. Petkov, M. Kabakchiev (1985). Productivity of broiler chickens raised in buildings with polymer coating during the summer and winter period. Second Symposium on the Application of Polymers in Agriculture, Forestry and Food Industry, October 1-5, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria, 3-9 (Bg).
  38. Petkov, G., M. Kabakchiev (1985). Comparative studies of microclimate and productivity in polymer and solid buildings for laying hens. 5th International Congress on Animal Hygiene, September 10-13, Hannover, FRG, vol. I, pp. 139-144 (Ru with abstract in English).
  39. Petkov, G. (1985). Gas- and heat exchange of broilers bred in industrial conditions. 5th International Congress on Animal Hygiene, September 10-13, Hannover, FRG, vol. I, pp. 133-135 (Ru with abstract in English).
  40. Petkov, G., G. Kaytazov, S. Dimitrov (1983). Study on the possibilities of raising broilers in buildings with a polymer coating. 17th World’s Poultry Congress, 8-12 August 1984, Helsinki, Finland, Proceedings and Abstracts, pp. 450-451 (Ru with abstract in English)..
  41. Petkov, G., M. Kabakchiev (1983). Assessment of the environmental factors in polymer buildings for laying hens. Second Scientific Symposium on Greening of Technologies in Industrial Animal Husbandry, November 15-16, 1983, Union of Scientists in Bulgaria, Vidin, Bulgaria, pp. 85-191 (Bg).
  42. Dimitrov, S., D. Dechev, G. Kaitazov, G. Petkov, G. Stefanov (1982). Characteristics of polymer buildings for poultry farming.  Symposium with International Participation: “The Role of Polymers for Intensification of Agriculture and Forestry”, May 5-7, 1982, Agricultural Academy – Central Cooperative Union, Plovdiv, Bulgaria, pp. 63-67 (Bg).

   Referred publications in Scientific papers, published in Bulgarian with abstracts in English:

  1. Petkov, G., D. Dimanov (1986). Gas – energy exchange in laboratory animals depending on the ambient temperature. Faculty of Zooengineering, Higher Institute of Zooengineering and Veterinary Medicine (HIZVM), Scientific Papers, vol. 34, 365-371.
  2. Ovesenska, L., G. Petkov, M. Panayotov (1986). Influence of some abiotic factors on the dynamics of growth and productivity in silkworm crosses. Faculty of Zooengineering, HIZVM, Scientific Papers, vol. 34, 292-304.
  3. Petkov, G. (1986). Influence of the microclimate on the growth and gas-energy exchange in broilers reared in a solid and polymer building, Faculty of Zooengineering, HIZVM, Scientific Papers, vol. 34, 126-133.
  4. Petkov, G., D. Dimanov (1985). Nature of growth in fattening lambs depending on environmental conditions. Faculty of Zooengineering, HIZVM, Scientific Papers, vol. 32, 502-506.
  5. Dimanov, D., G. Petkov (1985). Peculiarities of the vitamin PP use in lambs with normal and delayed development. Faculty of Zooengineering, HIZVM, Scientific papers, vol. 32, 209-213.
  6. Stoev, P., D. Dimanov, G. Petkov, A. Iliev, I. Manolov (1983). Acclimatization abilities of Saan breed billy-goats during the autumn-winter period in Stara Zagora region. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 390-398.
  7. Petkov, G., A. Iliev (1983). Zoohygienic characteristic of a reconstructed cowshed, pavilion type. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 203-212.
  8. Petkov, G., A. Iliev, D. Dimanov (1983). Gas-energy exchange in tied breeding of calves with different live weigh. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 169-178.
  9. Petkov, G., D. Dimanov, A. Iliev (1983). Influence of the ventilation system on the air microbial pollution in cowsheds. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 133-141.
  10. Petkov, G., M. Vutov (1983). Gas-energy exchange and growth in rabbits depending on the age and environmental conditions. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 83-90.
  11. Dimanov, D., G. Petkov, A. Iliev (1983). Influence of selenium on the growth of calves from one to four months of age. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 66-71.
  12. Kaitazov, G., G. Petkov, S. Dimitrov, G. Stefanov (1983). Zoohygienic studies in polymer buildings for broilers during the autumn-winter period. HIZVM, Faculty of Zooengineering, Scientific papers, Zemizdat State Publishing House, vol. 28, 32-39.

   Abstracts:

  1. Kostadinova, G., G. Petkov, V. Barakova (2009). Efficiency of wastewater treatment on a pig farm. IVth International Symposium of Livestock Production, September 9-12, Struga, Macedonia, Book of Abstracts, p. 185.
  2. Petkov, G., G. Kostadinova (1998). Air pollution from large livestock farms in Bulgaria. Proceedings of the International Conference on Livestock and the Environment, June 16-20, 1997, Ede/Wageningen, the Netherlands, p. 267.
  3. Petkov, G., K. Stankov, M. Kabakchiev, G. Geliazkov, (1991). Interrupted lighting programme for layers in houses supplied with luminescent lamps. II: Microclimate in the houses, livability and body weight of the layers. 6th International Symposium of Young Poultry Scientists, Wroclaw, Poland, September 4-6, 1991, p. 80.
  4. Kabakchiev, M., G. Geliazkov, G. Petkov, K. Stankov (1991). Interrupted lighting programme for layers in houses supplied with luminescent lamps, I: Productivity and Egg Quality. 6th International Symposium of Young Poultry Scientists, Wroclaw, Poland, September 4-6, 1991, p. 50.

Book Chapters:

  1. Yablanski, Ts., G. Petkov, D. Pavlov, V. Atanasov, G. Mikhailova, J. Staykov, V. Barakova, Sv. Georgieva, St. Atanasova, Ts. Zhelyazkova, G. Kostadinova, Ev. Raichev, D. Georgiev, M. Todorova, N. Takuchev, M. Georgiev, N. Georgieva, Sp. Stanilova, V. Gadzheva, G. Prakova, A. Zheleva, Z. Dobreva, B. Popov, P. Gidikova (2011). Handbook of Applied Ecology (Eds. Ts. Yablanski and G. Petkov), Alfamarket Publishing House, Stara Zagora, ISBN 978-954-9443-50-9, 318 pages (Bg). Chapter 1. Petkov, G. –  Atmosphere, pp. 15-65; Chapter 3. Soils, 3.3. Petkov, G. – Normative acts on protection and rational use of agricultural lands and soils, pp. 117-124; Chapter 4. Biological indicators for assessment of the environmental pollution, 4.1. Petkov, G. – Plants-indicators of air pollution, pp. 136-152; Chapter 9. Barakova, V., G. Petkov – Environmental impact assessments, pp. 245-273; Chapter 10. Barakova, V., G. Petkov – Environmental projects, pp. 275-279; Chapter 11. Barakova, V., G. Petkov – Environmental programs, pp. 281-286; Chapter 12. Petkov G., V. Barakova  – Environmental projects financing, pp. 288-294; Chapter 13. Petkov G., V. Barakova – Responsibilities in case of damage and pollution of the environment, pp. 296-303.
  2. Pfafenberger, V., V. Schultz, G. Petkov, B. Baykov, O. Petkova, G. Zhelyazkov, G. Kostadinova (1998). Energy – Environment: Policy and Regulation at National and International Level (Eds. V. Pfafenberger and G. Petkov), Faculty of Agriculture, Trakia University, Publishing House "2plus Ltd.", Stara Zagora, ISBN 982-8281-46-7 (Bg). Chapter 2. G. Petkov, G. Zhelyazkov and G. Kostadinova: Development of the state policy in Bulgaria for regulation of the system Energy – Environment in the agricultural sector, pp. 10-40; Chapter 4. G. Petkov, O. Petkova, B. Baykov, G. Zhelyazkov, G. Kostadinova: Opportunities for improving energy efficiency in the agricultural sector of Bulgaria through the application of sustainable environmentally friendly technologies, pp. 50-63.
  3. Banev, B., G. Bonev, St. Georgiev, N. Delchev, T. Dimitrov, Ev. Zhelyazkov, N. Kostadinova, M. Mikhailov, M. Panayotova, P. Petkov, G. Petkov, L. Sotirov, Sv. Tanchev, Il. Tsachev (1997). Handbook of Animal Husbandry, Part III – Dairy Cattle Breeding (Ed.  M. Panayotova), Information-Consultative and Qualification Service, Trakia University, Stara Zagora, ISBN 954-8180-56-1, 320 pages (Bg). Chapter 11. Cattle breeding technologies: Petkov, G. – Microclimate in barns for dairy cows and heifers, pp. 260-265; Petkov, G. – Storage, processing and utilization of dairy farms manure, pp. 266-270.
  4. Katsarov, V., G. Petkov, A. Iliev, D. Dinev et al. (1993). Handbook of Animal Husbandry, Part I – Pig Breeding (Ed. V. Katsarov), Extension Service, Higher Institute of Zooengineering and Veterinary Medicine, Stara Zagora, Bulgaria (Bg). Chapter 4. Dinev, D., A. Iliev, G. Petkov – Some features of pig farms construction; Chapter 5. Petkov, G., A. Iliev – Hygienic requirements at sows breeding; Chapter 6. Iliev, A., G. Petkov – Hygiene of farrowing and care of newborn pigs; Chapter 7. Petkov, G., A. Iliev – Hygienic requirements for breeding farrowed (lactating) sows with pigs until weaning.

       Applied Research and Technologies:

  1. Denev, S., G. Petkov, G., G. Kostadinova (2005). Method for reduction of air pollution with harmful emissions in livestock farms. Implementation Act No. 7/10.12.2005, APEPIT Ltd. Stara Zagora.
  2. Petkov, G., M. Kabakchiev, D. Petrunova, D. Dimanov, S. Dimitrov (1985). Technology for rearing of 1500 laying hens in cages in polymer buildings with thermal insulation. Higher Institute of Zooengineering and Veterinary Medicine (HIZVM), Stara Zagora. Order for implementation No. 00-497-00/22.11.1985 of the State Committee for Science and Technical Progress of Republic of Bulgaria.
  3. Petkov, G., M. Kabakchiev, D. Petrunova, D. Dimanov, S. Dimitrov (1985). Technology for rearing of 3000 broiler chickens in polymer buildings with thermal insulation. Higher Institute of Zooengineering and Veterinary Medicine (HIZVM), Stara Zagora. Order for implementation No. 00-497-00/22.11.1985 of the State Committee for Science and Technical Progress of Republic of Bulgaria.
  4. Stoev, P., G. Sinivirski, D. Dinev, G. Petkov, K. Dimitrov (1980). Technology for beef production in a calf-fattening farm, Elhovo town, Burgas district (Acceptance Protocol No. 491/26.11.1980, Scientific Research Sector at HIZVM, Stara Zagora).

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