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Effects of Pelleting and Varying Grain Intakes on Milk Yield and Composition

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Twelve cows were used in three replicates of a 4 x4 Latin-square design, to study the effects of meal as compared to pelleted concentrate, fed with two ratios of grain and roughage, on the yield and composition of milk and the relative proportions of rumen VFA.

Feeding pellets resulted in a highly significant increase (P < 0.01) in milk yield and a decrease (P < 0.05) in fat percentage when compared to meal concentrate. There were very small differences in feed intake in favor of the meal, but the efficiency of utilization of TDN for the production of FCM was slightly better for pellets.

Feeding low roughage-high concentrate rations resulted in a highly significant (P < 0.01) increase in milk protein content and a significant (P < 0.05) decrease in milk fat percentage, when compared to the high roughage-low concentrate rations. There were no appreciable effects on the solids-not-fat. TDN intake was 30% greater for the high concentrate rations. No differences in body weight changes were observed. The molar percentage of acetic acid was greater and butyric acid lower on the high-roughage rations than on low-roughage (P < 0.01). The proportion of the rumen propionic acid was not appreciably altered.

¹ Present address: University of California Agricultural Extension Service, Room 7, Post Office Building, Riverside, California.