1. Department of Geography and Environmental Science, University of Zimbabwe, Harare, Zimbabwe;
2. Department of Research and Specialist Services, Division of Livestock Research, Grasslands Research Institute, Marondera, Zimbabwe;
3. Department of Veterinary Science, University of Zimbabwe, Harare, Zimbabwe;
4. Department of Animal Production and Technology, School of Agricultural Sciences and Technology, Chinhoyi University of Technology, Chinhoyi, Zimbabwe;
5. Department of Livestock and Veterinary Services, Division of Veterinary Services, Harare, Zimbabwe;
6. Department of Animal Science, University of Zimbabwe, Harare, Zimbabwe