Caro-Costas, Rubén, and J. Vicente-Chandler. “MILK PRODUCTION BY HOLSTEIN COWS FED ONLY ON GRASS DURING FIVE CONSECUTIVE LACTATIONS”. The Journal of Agriculture of the University of Puerto Rico 60, no. 3 (July 1, 1976): 436–438. Accessed August 17, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/10535.