1. Department of Microbiology and Biochemistry, Faculty of Veterinary Medicine, Trakia University
2. Moscow State Academy of Veterinary Medicine and Biotechnology named after K.I. Skryabin
3. Department of Animal Nutrition, Faculty of Agricultural and Environmental Sciences, Szent Istvan University
4. All-Russian Institute of Poultry Husbandry
5. Department of Ecology and Genetics, Tyumen State University