1. School of Veterinary Medicine, Faculty of Agriculture and Natural Resources, University of Namibia, Windhoek, Namibia
2. Kalimbeza National Rice Project, Ministry of Agriculture, Water and Forestry, P. Bag 13184, Windhoek, Namibia
3. Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Namibia, Windhoek, 13301, Namibia