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The effect of dietary sodium on the energetic efficiency of microbial yield from the rumen of sheep

Published online by Cambridge University Press:  22 November 2017

R.J. Dewhurst  and
A.J.F. Webster
R.J. Dewhurst
Affiliation:
Department of Animal Husbandry, University of Bristol Langford House, Langford, Bristol BS18 7DU
A.J.F. Webster
Affiliation:
Department of Animal Husbandry, University of Bristol Langford House, Langford, Bristol BS18 7DU
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Extract

It has long been recognised that there is a strong positive relationship between the level of absorbed (microbial) purines and purine derivative excretion in the urine. We have used estimates based on urinary allantoin N excretion (AN) to investigate some of the factors influencing the energetic efficiency of microbial yield from the rumen (E). Figures 1 and 2 illustrate the model that has been adopted.

It has been tentatively assumed that, at reasonable levels of intake, exogenous purine supply exceeds “a” moles (Figure 2) so that purine salvage is saturated (Condon & Hatfield, 1970), de novo synthesis inoperant (Condon, Hall & Hatfield, 1970) and the net endogenous contribution to AN negligible. In these circumstances AN will be linearly related to microbial (purine) yield from the rumen.

Type
Sheep
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1989 , March 1989 , pp. 104
Copyright
Copyright © British Society of Animal Production 1989

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References

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