1MRC Centre for Reproductive Health, Queens Medical Research Institute, University of Edinburgh, Edinburgh, UK; 2MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, Western General Hospital, Edinburgh, UK.
1Institute of Animal Reproduction and Food Research, PAS, Olsztyn, Poland; 2C.I.I.S.A., Faculty of Veterinary Medicine, University of Lisbon, Lisbon, Portugal; 3Coimbra College of Agriculture, Coimbra, Portugal.