Ibarra, D., L. Latrille, and F. Wittwer. “Increasing of Rumen Undegradable Protein in Dairy Cows. 2. Effects on Nitrogen Utilization and Excretion”. Archivos de Medicina Veterinaria 38, no. 3 (December 29, 2006): 219–225. Accessed July 17, 2024. http://revistas.uach.cl/index.php/amv/article/view/4844.