Soltan, M.A., A.M. Mujalli, M.A. Mandour, and M. El-Shinway Abeer. “Effect of Dietary Rumen Protected Methionine and Or Choline Supplementation on Rumen Fermentation Characteristics and Productive Performance of Early Lactating Cows”. Pakistan Journal of Nutrition 11, no. 3 (February 15, 2012): 221–230. Accessed August 15, 2025. https://pjnonline.org/pjn/article/view/1601.