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Distillers Grains, Brewers Grains, and Urea as Protein Supplements for Dairy Rations

Department of Animal Husbandry and Nutrition, Cornell University, Ithaca, N. Y.

ABSTRACT

Two lactation experiments were conducted with 20 Holstein cows each, fed concentrate mixtures containing corn distillers dried grains, brewers dried grains, and urea as crude protein (nitrogen) supplements to a low-protein concentrate mixture. The protein-deficient basal ration resulted in weight loss, lower milk yields, and lower fat percentages than the other mixtures, and these changes were observed as early as 2 wk. after the cows were changed to the low-protein feed. The feeds containing corn distillers dried grains and brewers dried grains were superior to the low-protein feed with respect to total milk as well as fat-corrected milk yields. Urea was useful as a nitrogen source, but as an average was not so effective as the two other feeds. Corn distillers dried grains appeared to be somewhat more valuable than brewers dried grains.