1. UCD Veterinary Medicine, University College Dublin; Belfield, Dublin 4 Ireland
2. Department of Animal Behaviour; Institute of Genetics and Animal Breeding of the Polish Academy of Sciences; ul. Postepu 36A, Jastrzębiec, Magdalenka 05-552 Poland
3. Teagasc Animal and Grassland Research and Innovation Centre; Moorepark, Fermoy, Co. Cork Ireland