1. Onderstepoort Institute for Exotic Diseases; Private Bag X6 Onderstepoort 0110 South Africa
2. Department of Theriogenology; Faculty of Veterinary Science; University of Pretoria; Private Bag X4 Onderstepoort 0110 South Africa
3. Kruger National Park; PO Box 12 Skukuza 1350 South Africa
4. Kruger National Park; Private Bag X402 Skukuza 1350 South Africa