1. Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Wólka Kosowska, Poland
2. Faculty of Psychology, Warsaw University, Warsaw, Poland
3. Faculty of Animal Bioengineering, University of Warmia and Mazury of Olsztyn, Olsztyn, Poland
4. Faculty of Animal Sciences, Warsaw Agricultural University, Warsaw, Poland
5. Faculty of Animal Sciences, University of Kraków, Kraków, Poland