1. Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Poznan, Poland.
2. Department of Small Ruminant Breeding and Agricultural Advisory, University of Life Sciences in Lublin, Lublin, Poland.
3. Department of Horse Breeding and Use, University of Life Sciences in Lublin, Lublin, Poland.
4. Division of Horse Breeding, Poznan University of Life Sciences, Poznan, Poland.
5. Department of Horse Breeding, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.