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Effect of variations in dietary protein and of supplements of cod-liver oil on energy digestion and microbial synthesis in the rumen of sheep fed hay and concentrates

Published online by Cambridge University Press:  27 March 2009

J. D. Sutton ,
R. H. Smith ,
A. B. McAllan ,
J. E. Storry  and
D. A. Corse
J. D. Sutton
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9 AT
R. H. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9 AT
A. B. McAllan
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9 AT
J. E. Storry
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9 AT
D. A. Corse
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9 AT
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Summary

Estimates have been made of the amount of energy fermented and the amounts of microbial protein and total fatty acids synthesized in the rumen of sheep given various rations of hay and concentrates. The sheep had re-entrant cannulas in the proximal duodenum. The amount of protein synthesized was calculated from the flow of RNA-N at the duodenum. The change in the amount of total fatty acids between the food and the proximal duodenum was also measured.

In Expt 1, six sheep were given a low-protein basal diet and the same diet supplemented with a vegetable protein concentrate with or without tannin treatment. Some 72% of the digestible energy was apparently digested in the rumen and an estimated 150–170 g microbial protein were synthesized per kg organic matter apparently digested in the rumen. Differences due to the dietary treatments in the amount of energy digested and the amount of microbial protein synthesized were small and non-significant.

In Expt 2, the effect of a supplement of 20 g/day of cod-liver oil (CLO) on digestion of a mixed diet of hay and concentrates was examined in five sheep. Despite a marked fall in the ratio of acetic acid to propionic acid in the rumen volatile fatty acids when CLO was added, there were no clear differences in the amount of energy fermented in the rumen, which averaged 64% of the digestible energy, or in the efficiency of microbial protein synthesis, which averaged 200 g/kg organic matter apparently digested in the rumen. On the basal diet an increase of 6·7 g total fatty acid/day occurred in the stomach. This was presumably synthesized in the rumen. However when CLO was added to the diet, a decrease of 4·1 g total fatty acid/day was measured.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 2 , April 1975 , pp. 317 - 326
Copyright
Copyright © Cambridge University Press 1975

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