Affiliation: | 1. Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, , Onderstepoort, South Africa;2. Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, , Onderstepoort, South Africa;3. Veterinary Genetics Laboratory, Faculty of Veterinary Science, University of Pretoria, , Onderstepoort, South Africa |