Institution: | 1. Department of Production Animal Studies, Faculty of Veterinary Science, 0110 Onderstepoort, South Africa;2. Vetsuisse Fakultät Universität Zürich, Winterthurerstrasse 260, 8057 Zürich, Switzerland;3. Missouri University, Veterinary Medical Teaching Hospital, A331 Clydesdale Hall, 379 Campus Drive, Columbia, MO 65211, USA |