Institution: | (1) Animal Sciences Group, Wageningen University and Research Centre, P.O. Box 65, 8200 AB Lelystad, The Netherlands;(2) School of Agriculture, Food and Rural Development, University of Newcastle, King George VI Building, NE1 7RU Newcastle upon Tyne, UK;(3) Department of Animal Environment and Health, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, P.O. Box 234, SE-53223 Skara, Sweden |