1. School of Agriculture and Food Science; University College Dublin; Dublin 4 Ireland
2. Department of Small Mammals Breeding and Raw Materials of Animal Origin; Poznan University of Life Sciences; 62-002 Suchy Las Poland
3. Department of Animal Sciences; Institute of Genetics and Animal Breeding of the Polish Academy of Sciences; 05-552 Magdalenka Poland
4. Faculty of Chemistry; Adam Mickiewicz University; 61-614 Poznań Poland
5. Animal Production Department; Neiker-Tecnalia; Arkaute Agrifood Campus E-01080 Vitoria-Gasteiz Spain