1. Biochemistry Division, National Veterinary Research Institute, Vom, Nigeria;
2. Department of Veterinary Pharmacology and Toxicology, Ahmadu Bello University, Zaria, Nigeria;
3. Department of Veterinary Physiology, Ahmadu Bello University, Zaria, Nigeria;
4. Department of Veterinary Pathology, Ahmadu Bello University, Zaria, Nigeria