Caro-Costas, Rubén, José Vicente-Chandler, and Fernando Abruña. “Effect of Four Levels of Concentrate Feeding on Milk Production by Holstein Cows Grazing Intensively Managed Tropical Grass Pastures”. The Journal of Agriculture of the University of Puerto Rico 56, no. 2 (April 1, 1972): 97–103. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10853.