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Metabolism of Leucine and Valine within the Rumen^{1, 2,}

Department of Dairy Science, University of Wisconsin, Madison

ABSTRACT

L-leucine and DL-valine, placed in the rumen of fistulated goats, were extensively metabolized within the rumen, yielding large quantities of isovaleric and isobutyric acids, respectively. Both amino acids tended to decrease the level of acetic, propionic, and butyric acids in the rumen.

Compared to a standard hay diet, the feeding of pelleted corn just prior to amino acid administration decreased the concentration of -amino N in the rumen 4 hr after feeding. Pelleted corn significantly decreased the isobutyric acid level at 4 hr when compared to similar treatments on the hay diet. A similar effect of pelleted corn on isovaleric acid level at 4 hr was noted when leucine was administered.

¹ Published with the approval of the Director of the Agricultural Experiment Station.

² These data are part of a thesis presented by the senior author to the University of Wisconsin in partial fulfillment of the requirements of the degree of Master of Science.

³ Recipient of a National Science Foundation Fellowship.