1. 1 Department of Pig Breeding , National Research Institute of Animal Production , 32-083 Balice n. Kraków , Poland
2. 2 Department of Animal Molecular Biology , National Research Institute of Animal Production , 32-083 Balice n. Kraków , Poland
3. 3 Department of Pig Breeding and Biotechnology, Department of Animal Breeding and Agricultural Consulting, Faculty of Animal Sciences and Bioeconomy , University of Life Sciences in Lublin , Akademicka 13, 20-950 Lublin , Poland