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Impact of variation in yield of gas during incubation on simulated gas production and extent of ruminal degradation

Published online by Cambridge University Press:  20 November 2017

J. Dijkstra ,
J. France ,
S. Lopez  and
M.S. Dhanoa
J. Dijkstra
Affiliation:
Animal Nutrition Group, Wageningen Institute of Animal Sciences WIAS, Wageningen Agricultural University, Marijkeweg 40, 6709 PG Wageningen, the Netherlands
J. France
Affiliation:
The University of Reading, Department of Agriculture, Earley Gate, Reading RG6 6AT, Berkshire, UK
S. Lopez
Affiliation:
Department of Animal Production, University of Leon, 24007 Leon, Spain
M.S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Dyfed SY23 3EB, UK
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Extract

To calculate the extent of ruminal degradation based on the gas production technique, equations were derived to describe gas production profiles from substrate degradation (France et al. submitted). This derivation demonstrated that if the yield of gas (Y; ml/g degradable OM) produced during the course of incubation varies significantly, then the calculated extent of degradation is not correct. Variation in Y may occur due to variation in the yield of individual volatile fatty acids (VFA) produced. The objective of this simulation study was to examine the impact of variation in individual VFA production and consequently in yield of gas on the extent of ruminal degradation.

Gas production profiles were simulated based on a generalized Mitscherlich (GM) equation (see France et al. submitted) for three substrates (soluble sugars, starch, fibre) that differ in degradation rate and VFA production profile (see Table 1).

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1999 , 1999 , pp. 38
Copyright
Copyright © The British Society of Animal Science 1999

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References

France, J., Dijkstra, J., Dhanoa, M.S., Lopez, S. and Bannink, A. Estimating the extent of degradation of ruminant feeds in vivo from a description of their gas production profiles observed in vitro: 1. Derivation of models and other mathematical considerations. British Journal of Nutrition (submitted).Google Scholar