W. J. Bertu1*, I. Ajogi2, J. O. O. Bale3, J. K. P. Kwaga2 and R. A. Ocholi4
1Bacterial Research Division, National Veterinary Research Institute, Vom, Plateau State, Nigeria.
2Department of Veterinary Public Health and Preventive Medicine, Ahmadu Bello University, Zaria, Kaduna State, Nigeria.
3Animal Reproduction Programme, National Animal Production Research Institute, Shika, Ahmadu Bello University, Zaria, Kaduna state, Nigeria.
4Quality Control Division, National Veterinary Research Institute, Vom, Plateau State, Nigeria.
