1. Section of Reproduction, 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. Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
4. Centre for Microbial and Environmental Genomics, Department of Genetics, Faculty of Natural Sciences, University of Pretoria, Hatfield, South Africa
5. Veterinary Genetics Laboratory, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa