Randel, P.F. and Mendoza, N. 1983. Effects of Concentrate Supplementation to Holstein Heifers Grazed at a High Stocking Rate on Intensively Managed Pastures from Breeding Age to Parturition. The Journal of Agriculture of the University of Puerto Rico. 67, 4 (Oct. 1983), 476–485. DOI:https://doi.org/10.46429/jaupr.v67i4.7742.