1. The Scientific Society of Veterinary Medicine Students, Warsaw University of Life Sciences (WULS–SGGW), 02-787 Warsaw, Poland
2. Department of Animal Breeding, Institute of Animal Science, Warsaw University of Life Sciences (WULS–SGGW), 02-787 Warsaw, Poland
3. Department of Large Animal Diseases and Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences (WULS–SGGW), 02-787 Warsaw, Poland