1. Sumy State University, Department of Public Health, Rymskogo-Korsakova 2, Sumy 40007, Ukraine
2. Wroclaw University of Environmental and Life Sciences, Department of Biostructure and Animal Physiology, Norwida 31, Wroclaw 50-375, Poland
3. Wroclaw University of Environmental and Life Sciences, Department of Cattle Breeding and Milk Production, Chełmońskiego 38c, Wroclaw 51-630, Poland
4. University of Veterinary Medicine and Pharmacy, Department of Animal Breeding, Komenskeho 73, Kosice 041 81, Slovak Republic