1College of Veterinary Medicine, Mekelle University, P. O. Box 231, Mekelle, Ethiopia.
2College of Veterinary Medicine, Addis Ababa University, P. O. Box 34, Debre Zeit, Ethiopia.
3Debre Zeit Agricultural Research Center, P. O. Box 32, Debre Zeit, Ethiopia.
4International Livestock Research Institute, ILRI Addis, P. O. Box 5689, Addis Ababa, Ethiopia.
Email: [email protected]