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Yield of microbial protein in sheep fed diets differing in protein degradability

Published online by Cambridge University Press:  05 November 2021

A.J.F. Webster ,
Shule Kaya ,
M.E. Kitcherside  and
E.F. Glen
A.J.F. Webster
Affiliation:
Department of Clinical Veterinary Science, University of Bristol, Langford House, Bristol BS18 7DU
Shule Kaya
Affiliation:
Department of Clinical Veterinary Science, University of Bristol, Langford House, Bristol BS18 7DU
M.E. Kitcherside
Affiliation:
Department of Clinical Veterinary Science, University of Bristol, Langford House, Bristol BS18 7DU
E.F. Glen
Affiliation:
Department of Clinical Veterinary Science, University of Bristol, Langford House, Bristol BS18 7DU
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Extract

Modern protein systems for ruminants require estimates of microbial protein yield relative to the amount of energy fermented in the rumen. In the Metabolizable Protein (MP) System (Webster 1992) this is expressed by the ratio of microbial nitrogen to fermented metabolizable energy (MiN:FME). However uncertainty as to the estimation of MiN yield both in absolute terms and relative to rumen degradable N (RDN) generates further uncertainty as to the efficiency of capture of quickly and slowly degraded N (QDN and SDN). Moreover the MP system assumes no capacity to recapture recycled undegraded N (UDN). This experiment measures increments in excretion of purine derivatives by sheep to explore the effects of varying relative and absolute supply of QDN, SDN and UDN on relationships between FME utilisation and yield of microbial N from the rumen.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 126
Copyright
Copyright © British Society of Animal Science 1997

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References

Chen, X,B, Hovell, F.D.de B., Orskov, E.R. and Brown, D.S. 1990 Excretion of purine derivatives by ruminants: endogenous excretion, differences between cattle and sheep British Journal of Nutrition, 63,121–129.CrossRefGoogle Scholar
Webster, A.J.F. 1992 The Metabolizable Protein System for Ruminants. pp93–112 in Recent Advances in Animal Nutrition, eds Wiseman, J & Cole, D.J.A., Butterworths, London.CrossRefGoogle Scholar