Elobied, G. H., 		Dafalla, A.A, 		A.Abdalla, Asma, 		Mohammed, Imtithal, 		Fadiel, Aziza, AND 		Abdalla, Isam.
" Effect of production systems on the performance of dairy cows in the Gezira State, Sudan" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 15 Number 2 (1 December 2017)