J. Anim Sci.
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J. Anim Sci. 1975. 40:523-529.
© 1975 American Society of Animal Science
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Influence of Branched-Chain Volatile Fatty Acids on Nitrogen Utilization by Lambs Fed Urea Containing High Roughage Rations1

N. N. Umunna2, Terry Klopfenstein and Walter Woods3

University of Nebraska, Lincoln 68503

Abstract

In two of three studies, feeding or rumen infusion of isobutyric and/or isovaleric acids or feeding casein to lambs on high roughage, urea supplemented rations improved nitrogen retention and decreased urinary nitrogen loss. Neither rumen ammonia nor blood urea concentrations were affected by the acids. Rumen branched-chain volatile fatty acid (BVFA) concentrations were higher in lambs supplemented with soybean meal, casein or BVFA than lambs supplemented with urea alone. The acids did not affect (P > .05) dry matter or protein digestibility.

Footnotes

1 Published with the approval of the Director as Paper No. 3666, Journal Series, Nebraska Agriculture Experiment Station. Research reported was conducted under Project No. 13-14.

2 Present address: Department of Animal Science, Faculty of Agriculture, Ahmadu Bello University, Zaria, Nigeria.

3 Present address: Department of Animal Science, Purdue University, Lafayette, Indiana 47907.






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Copyright © 1975 by the American Society of Animal Science.