1. Cell and Molecular Biology Laboratory, Veterinary Science Centre, University College Dublin, Dublin;
2. Animal and Bioscience Research Department, Animal and Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co. Meath;
3. Teagasc, Moorepark Dairy Production Research Centre, Fermoy, Co. Cork; and
4. Livestock Systems Research Department, Animal and Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co. Meath, Ireland