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Randel, P.F. 1965. Comparison of Simple vs. Complex Concentrate Mixtures for Dairy Cattle in Puerto Rico: Feeding Heifers in Dry Lot. The Journal of Agriculture of the University of Puerto Rico. 49, 3 (Jul. 1965), 342–349. DOI:https://doi.org/10.46429/jaupr.v49i3.13034.