Randel, Paul F. “Complete Rations Containing Coarsely Chopped or Ground Hay for Dairy Cows in Confinement Vs. Conventional Grazing”. The Journal of Agriculture of the University of Puerto Rico 75, no. 3 (July 1, 1991): 241–251. Accessed June 28, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/3592.