1. Teagasc, Animal & Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland
2. School of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland
3. Department of Agriculture, Food and the Marine, Regional Veterinary Laboratory, Model Farm Road, Cork, T12 XD51, Ireland
4. Department of Agriculture, AgResearch, Invermay Agricultural Centre, Mosgiel 9092, New Zealand
5. Department of Agriculture, University of Kent, School of Biosciences, University of Kent, Canterbury, CT2 7AF, UK
6. Department of Agriculture, Irish Cattle Breeding Federation, Bandon, Co. Cork, Ireland