Khampa, S., Chaowarat, P., Singhalert, R., & Wanapat, M. (2009). Effects of Protein Level in Concentrate and Urea-Treated Corn Silage on Rumen Ecology and Milk Production in Lactating Dairy Cows. Pakistan Journal of Nutrition, 8(5), 588-591. https://doi.org/10.3923/pjn.2009.588.591