1. Department of Dairy Technology, Faculty of Food Science and Nutrition; Poznań University of Life Sciences; 60-624 Poznań Poland
2. Department of Small Mammalian Breeding and Animal Products; Poznań University of Life Sciences; 62-002 Suchy Las Poland
3. Institute of Genetics and Animal Breeding of the Polish Academy of Sciences in Jastrzębiec; 05-552 Magdalenka