J. Anim Sci.
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J. Anim Sci. 1972. 35:896-900.
© 1972 American Society of Animal Science
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Effect of Ration Composition and Protein Level on Plasma Free Tryptophan and Ruminal Microbial Tryptophan Content in Sheep1

C. L. Fenderson2 and W. G. Bergen2

Michigan State University, East Lansing 48823

Abstract

STUDIES were initiated to investigate the influence of different nutritional regimen on blood plasma tryptophan concentrations and rumen microbial tryptophan content in mature sheep. Bacterial content of tryptophan was not affected by different nutritional regimen or time of rumen sampling. Protozoal tryptophan content was affected by the type of ration. Ruminal protozoa harvested from sheep fed low protein—semi purified and high protein—high concentrate rations contained significantly less (P<.01) tryptophan than protozoa from sheep fed adequate protein—roughage based rations. Ruminal bacteria contained significantly higher (P<.01) amounts of tryptophan than ruminal protozoa.

Diurnal patterns of plasma tryptophan and alpha amino nitrogen concentrations were not influenced by consumption of different rations by sheep. Alpha amino nitrogen showed a byphasic 24-hr. pattern while tryptophan showed a less distinct, but similar 24-hr. pattern.

Rumina administration of readily available energy did not reduce plasma tryptophan levels while total essential amino acids were significantly (P<.05) reduced. Based on the known effects of rapid energy availability on plasma amino acid levels, tissue amino acid uptake and protein synthesis, these findings suggested that tryptophan did not limit amino acid utilization and protein metabolism in mature sheep during this study.

Footnotes

1 Michigan Agricultural Experiment Station Journal Article No. 5878.

2 Ruminant Nutrition Laboratory, Department of Animal Husbandry.






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Copyright © 1972 by the American Society of Animal Science.