T, Ahmed Nabaweia, K.E. Elabid, A.M. Fadel Elseed, and A. Elhag. 2010. “Evaluation of Production and Economic Feasibility of Using the Recommended Nutrient Requirement for Lactating Cows”. Pakistan Journal of Nutrition 9 (5): 444–446. https://doi.org/10.3923/pjn.2010.444.446.