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Models for interpreting in vitro gas production profiles from ruminant foods

Published online by Cambridge University Press:  27 February 2018

J. France
Affiliation:
Institute of Grassland and Environmental Research, North Wyke, Okehampton, Devon EX20 2SB
S. Lopez
Affiliation:
Department of Animal Production, University of Leon, 24007 Leon, Spain
J. Dijkstra
Affiliation:
Wageningen Institute of Animal Sciences WIAS, Department of Animal Nutrition, Marijkeweg 40, 6709 PG Wageningen, The Netherlands
R. Sanderson
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB
M.S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB
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Extract

The automation of existing in vitro gas production methods (Beuvink et al., 1992) and the development of new ones (Theodorou et al., 1994) have created a need for suitable mathematical models to describe and interpret cumulative gas production profiles. Ideally a function is required which is capable of modelling a range of shapes with no inflexion point and also a range of sigmoidal shapes in which the inflexion point is variable. Several models have been proposed to describe gas production profiles (e.g. Blümmel and Ørskov, 1993; Beuvink and Kogut, 1993; Schofield et al ., 1994), sometimes blending empiricism with a more mechanistic view based on a compartmental scheme. The primary objectives of this paper are to present a unifying analysis of this area, pointing out compartmental interpretations of some of the candidate models and to link the gas production technique to animal performance by determining the extent of ruminal degradation for each model.

Type
In vitro techniques for measuring rumen microbial activity
Copyright
Copyright © British Society of Animal Science 1998

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References

Beuvink, J. M. W. and Kogut, J. 1993. Modeling gas production kinetics of grass silages incubated with buffered ruminal fluid. Journal of Animal Science 71: 10411046.CrossRefGoogle ScholarPubMed
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France, J., Dhanoa, M. S., Theodorou, M. K., Lister, S. J., Davies, D. R. and Isaac, D. 1993. A model to interpret gas accumulation profiles associated with in vitro degradation of ruminant feeds. Journal of Theoretical Biology 163: 99111.CrossRefGoogle Scholar
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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 feedstuffs. Animal Feed Science and Technology 48: 185197.CrossRefGoogle Scholar

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