J. Anim Sci.
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J. Anim Sci. 1966. 25:765-773.
© 1966 American Society of Animal Science
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Effects of Defaunation on Feed Digestibility, Rumen Metabolism and Blood Metabolites1,2,

T. J. Klopfenstein3, 4,, D. B. Purser3, 4, and W. J. Tyznik3, 4,

Ohio State University, Columbus

Abstract

Two trials were carried out to investigate the influence of protozoa upon ruminant metabolism. The presence of protozoa increased rumen ammonia concentration, but plasma urea levels did not always show corresponding increases. It is suggested that lysine may have been the limiting amino acid when the lambs were defaunated, but that no one amino acid was consistently limiting after protozoa were established. Plasma amino acid concentrations were lower in faunated than in defaunated lambs.

Faunation resulted in greater dry matter digestion with two of the three rations, and volatile fatty acid ratios were also altered. The major effect was an increase in butyric acid. Plasma lipid fatty acid distribution indicated greater proportions of oleic acid and smaller proportions of linoleic acid following faunation. Plasma glucose concentrations were not affected.

Footnotes

1 This study was made possible by NIH Training Grant T1ES 17.

2 Supported in part by Eli Lilly and Company.

3 Institute of Nutrition and Food Technology.

4 Department of Animal Science.




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BOARD-INVITED REVIEW: Recent advances in biohydrogenation of unsaturated fatty acids within the rumen microbial ecosystem
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[Abstract] [Full Text] [PDF]


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