Shehab Ahmed A. Effectof adding of vitamin b12 to tris extender and cooling period on the sperms viablilty for awassi rams. JKAS [Internet]. 2017 Jun. 1 [cited 2024 Nov. 5];4(2):59-70. Available from: https://journals.uokerbala.edu.iq:8443/index.php/Agriculture/article/view/182