Affiliation: | 1. Department of Production Animal Clinical Sciences, Norwegian School of Veterinary Science, P.O. Box 8146 Dep., 0033 Oslo, Norway;2. UMRH 1213 Herbivores, INRA Clermont-Ferrand – Theix Centre, F 63122 St Genès-Champanelle, France;3. Department of Psychological and Brain Sciences and Center for the Integrated Study of Animal Behavior, 1101 E. 10th Street, Indiana University, Bloomington, IN 47405, USA;4. Scottish Agricultural College, Roslin Institute Building, Easter Bush, Penicuik, Midlothian, Edinburgh EH25 9RG, UK |