J. Anim Sci.
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J. Anim Sci. 1979. 48:598-606.
© 1979 American Society of Animal Science
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Effect of Diet on Partial Efficiency of Acetate Use for Body Tissue Synthesis by Mature Cattle

H. F. Tyrrell, P. J. Reynolds and P. W. Moe1

U. S. Department of Agriculture, Beltsville, MD 20705

Abstract

Acetic acid was infused into the rumen of four mature nonpregnant, nonlactating Holstein cows fed different diets. Diets of either 100% alfalfa hay or 30% alfalfa hay, 57% corn, 11% soybean meal, and 2% ground limestone were fed in each of two single reversal experiments. Acetate infusion resulted in no measurable change in blood acid-base balance nor in blood plasma ketone or glucose concentration. Acetate infusion slightly increased fecal energy and decreased energy loss as methane, urine, or as both. Use of metabolizable energy from acetic acid was 27% for cows fed the 100% hay diet and 69% for cows fed the 30% hay diet. The type of basal diet fed markedly affects the partial efficiency of acetate use for body tissue synthesis by mature cattle.

Footnotes

1 Ruminant Nutrition Laboratory, Nutrition Institute, SEA, USDA, Beltsville, MD 20705. The authors express appreciation to Dr. T. L. Pike for surgical issistance; to Mr. R. L. Brocht, Mr. J. Ridley and Ms. C. L. Walton for care of experimental animals and conduct of metabolism trials; to Mr. F. E. Sweeney for conduct of respiration measurements; to Mr. C. Jackson, Jr. and Mr. B. F. Gadsden for conduct of blood analyses; to Mr. T. B. Jacobs and Ms. L. Moy for chemical analysis; and to Ms. B. D. Owens for overview and computation of the data reported.






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Copyright © 1979 by the American Society of Animal Science.