Hostname: page-component-7479d7b7d-pfhbr Total loading time: 0 Render date: 2024-07-08T14:36:44.444Z Has data issue: false hasContentIssue false
  • English
  • Français

Use of allantoin excretion to assess the energetic efficiency of rumen microbial protein yield in sheep

Published online by Cambridge University Press:  21 November 2017

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

Extract

The energetic efficiency of microbial protein yield from the rumen (E) is a major element of uncertainty in systems describing the supply and utilisation of dietary protein in ruminants. The relationship between microbial growth rate and E can be described with some precision in vitro but the situation is complicated in vivo by the necessity to determine microbial outflow rate from the rumen. The Agricultural Research Council (ARC 1984) assumed a fixed value of 32g microbial N/kg DOMR (organic matter apparently digested in the rumen) or 1.34g microbial N/MJ Metabolizable Energy (1.34g MN/MJME) while recognising that there are sound theoretical reasons why the relationship might better be described by a variable function.

Type
Ruminant Nutrition and Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1987 , March 1987 , pp. 55
Copyright
Copyright © The British Society of Animal Production 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Agricultural Research Council (1984) “The nutrient requirements of ruminant livestock. Supplement No.l.” CAB, Slough.Google Scholar
Borchers, R. (1977) Analytical Biochemistry 79, 612–613.Google 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
Uden, P., Colucci, P.E. & Van Soest, P.J. (1980). Journal of the Science of Food and Agriculture 31, 625–632.Google Scholar