1. Animal & Bioscience Department, Teagasc, Grange, Dunsany, Co. Meath, Ireland.
2. University College Dublin, Belfield, 4, Dublin, Ireland.
3. Irish Cattle Breeding Federation, Bandon, Co. Cork Ireland.
4. AgResearch, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand.
5. Animal & Bioscience Department, Teagasc, Moorepark, Co. Cork, Ireland.