Elobied, G., 		Dafalla, A., 		A.Abdalla, A., 		Mohammed, I., 		Fadiel, A., & 		Abdalla, I.
(2017).
 Effect of production systems on the performance of dairy cows in the Gezira State, Sudan.
<em>Gezira Journal Of Agricultural Science, 15</em>(2).
Retrieved from <a href="http://journals.uofg.edu.sd/index.php/gjas/article/view/981" target="_new">http://journals.uofg.edu.sd/index.php/gjas/article/view/981</a>