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]