1. Animal Reproduction Unit, Jigawa Research Institute, Kazaure, Jigawa State, Nigeria
2. Department of Veterinary Surgery and Medicine, Faculty of Veterinary Medicine, Ahmadu Bello University, P.O. Box 720 Zaria, Kaduna state, Nigeria
3. Department of Veterinary Public Health and Preventive Medicine, Faculty of Veterinary Medicine, Ahmadu Bello University, P.O. Box 720 Zaria, Kaduna state, Nigeria
4. National Animal Production Research Institute Shika, Ahmadu Bello University, P.O. Box 720 Zaria, Kaduna state, Nigeria