Randel, Paul F. “Two Hay: Concentrate Ratios in Total Mixed Rations for Cows at Different Stages of Lactation”. The Journal of Agriculture of the University of Puerto Rico 79, no. 1-2 (April 1, 1995): 29–39. Accessed April 18, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/4296.