1. Poznań University of Life Sciences, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland.
2. Topigs Norsvin Research Centre, Schoenaker 6, 6641 SZ Beuningen, the Netherlands.
3. Topigs Norsvin, R. Visc. do Rio Branco, 1310 Centro, Curitiba, PR, 80420-210, Brazil.