Bello, A., Y. A. Adamu, M. A. Umaru, S. Garba, A. U. Abdullahi, M. K. Adamu, B. Saidu, S. Ukashatu, S. A. Hena, and A. Mahmuda. 2012. “Morphometric Analysis of the Reproductive System of African Zebu Cattle”. Scientific Journal of Zoology 1 (2):31-36. http://www.sjournals.com/index.php/sjz/article/view/1187.