Randel, P. F., & 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), 476–485. https://doi.org/10.46429/jaupr.v67i4.7742