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Effects of Manipulating Rumen Fermentation and Outflow Rate in Sheep on Microbial Protein Yield as Estimated from Allantoin Excretion

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

New schemes describing the protein nutrition of ruminants consider both host and microbe requirements for nitrogenous compounds, truly absorbed amino N (TAAN) and rumen degradable N (RDN) respectively. This has made the prediction of the energetic efficiency of rumen microbial protein yield (E,MiN) crucial. However there is little guidance concerning the prediction of E,MiN since there are few consistent relationships in the literature. We face the dilemma that current techniques for measuring E,MiN are costly, invasive and laborious which makes it difficult to conduct large, designed and replicated experiments to investigate sources of variation. We have adopted the much simpler techniques of measuring urinary allantoin excretion to investigate sources of variation in E,MiN. Our objective was to investigate effects on E,MiN of varying rumen outflow rates by nutritional (level of intake and diet digestibility), and non-nutrition (supplementary NaHCO3) methods.

Type
Energy and Protein Utilisation by Dairy cows
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1988 , March 1988 , pp. 26
Copyright
Copyright © The British Society of Animal Production 1988

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References

Antoniewicz, A.M. & Pisulewski, P.M. (1982) J. agric. Sci.(Camb.) 98: 221–223.CrossRefGoogle Scholar
Borchers, R. (1977) Analytical Biochemistry 79: 612–613.CrossRefGoogle Scholar
Condon, R.J. & Hatfield, E.E. (1970) J. Anim. Sci. 31: 1037A.Google Scholar
Condon, R.J., Hall, G. & Hatfield, E.E. (1970) J. Anim. Sci. 31: 1037A.Google Scholar
Fujihara, T., Ørskov, E.R., Reeds, P.J. & Kyle, D.J. (1987) J. agric. Sci. (Camb.) 109: 7–12.CrossRefGoogle Scholar
Rys, R., Antoniewicz, A. & Maciejewicz, J. (1975) In “Tracer studies on non-protein nitrogen for ruminants II”, pp.95–98. International Atomic Energy Agency, Vienna.Google Scholar