St. Louis, D. G., H. Cestero, F. Román-García, J. A. Arroyo-Aguilú, and R. E. McDowell. “Value of Supplementary Feeding With Pelleted Maize or Grass Hay for Lactating Cows Grazing Fertilized Grass Pastures in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 63, no. 3 (July 1, 1979): 390–399. Accessed May 31, 2023.