Affiliation: | a Department of Large Animal Clinical Studies, Faculty of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland b Department of Statistics, University College, Dublin, Belfield, Dublin 4, Ireland c Department of Veterinary Clinical Science and Animal Husbandry, University of Liverpool, Leahurst, Neston, South Wirral CH64 7TE, UK d Central Veterinary Research Laboratory, Abbotstown, Dublin 15, Ireland |