1. Department of Animal Product Technology, Faculty of Food Technology , University of Agriculture in Krakow , ul. Balicka 122, 31-149 Kraków , Poland
2. National Research Institute of Animal Production , 32-083 Balice n. Kraków , Poland
3. Department of Genetics and Animal Breeding, Faculty of Animal Science , University of Agriculture in Krakow , al. Mickiewicza 24/28, 30-059 Kraków , Poland