M. ATTA and O. A. E. L. KHIDIR, “Effect of age and diet on some productive traits of a flock of Sudan Nilotic ewes”, Indian J of Anim Sci, vol. 76, no. 2, Jan. 2011, Accessed: Oct. 23, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/3597