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A non-invasive approach to determining extent of degradation in the rumen

Published online by Cambridge University Press:  20 November 2017

L.A. Crompton
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
J. France
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
E. Kebreab
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
J.A.N. Mills
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK
M.S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB, UK
S. López
Affiliation:
Departamento de Producción Animal, Universidad de León, E-24007 León, Spain
J. Dijkstra
Affiliation:
WIAS Animal Nutrition Group, Wageningen Agricultural University. Marijkeweg 40, 6709 PG Wageningen. The Netherlands
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Extract

A non-invasive method is proposed for determining the extent of degradation in the rumen, based on the gas production technique and mathematical modelling. The exercise involves developing both a statistical model and a kinetic model (France et al., 2000). The statistical model shifts (or maps) the gas accumulation profile obtained using a faecal inoculum to a rumen gas profile, thus obviating the need for rumen sampling. The kinetic model determines the extent of degradation in the rumen from the shifted profile. It is presented as a generalised mathematical function, allowing any one of a number of alternative equation forms to be selected.

Type
Threatre Presentations
Copyright
Copyright © The British Society of Animal Science 2001

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References

France, J., Dhanoa, M. S., Theodorou, M. K., Lister, S. J., Davies, D. R. and Isac, D. 1993. A model to interpret gas accumulation profiles with in vitro degradation of ruminant feeds. Journal of Theoretical Biology 163: 99111.CrossRefGoogle Scholar
France, J, Dhanoa, M.S., Crompton, L.A., Lopez, S., Dijkstra, J., Mauricio, R.M., Kebreab, E. and Owen, E. 2000. A non-invasive approach to determining extent of degradation in the rumen. In Gas Production: Fermentation Kinetics for Feed Evaluation and to Assess Microbial Activity, Proceedings of the EAAP Satellite Symposium on Gas Production, 18-19 August 2000, Wageningen, The Netherlands, pp 3341. Edinburgh, British Society of Animal Science.Google Scholar
Mauricio, R. M., Owen, E., Mould, F. L., Givens, D. I., Theodorou, M. K., France, J., Davies, D. R. and Dhanoa, M. S. 2000. Comparison of bovine rumen liquor and bovine faeces as inoculum for an in vitro gas production technique for evaluating forages. Animal Feed Science and Technology (submitted).Google Scholar
Theodorou, M. K., Williams, B. A., Dhanoa, M. S., McAllan, A. B. and France, J. 1994. A simple gas production method using a pressure transducer to determine the fermentation kinetics of ruminant feeds. Animal Feed Science and Technology 48: 185197.CrossRefGoogle Scholar
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