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Ryszard Mordak
Department of Internal Medicine, Faculty of Veterinary Medicine,
Wroclaw University of Environmental and Life SciencesWrocław, Poland
Robert Kupczyński
Department of Environment Hygiene and Animal Welfare, Faculty of Biology and Animal Science,
Wroclaw University of Environmental and Life SciencesWrocław, Poland
Marian Kuczaj
Institute of Animal Breeding,
Wroclaw University of Environmental and Life SciencesWrocław, Poland
Wojciech Niżański
Department of Reproduction and Clinic of farm Animals, Faculty of Veterinary Medicine,
Wroclaw University of Environmental and Life SciencesWrocław, Poland