1. National Agricultural Extension and Research Liaison Services, Ahmadu Bello University, Zaria, Nigeria.
2. Department of Veterinary Parasitology and Entomology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria.
3. Department of Veterinary Physiology and Pharmacology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria.