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Estimating the extent of degradation of ruminant feeds from a description of their gas production profiles observed in vitro:derivation of models and other mathematical considerations

Published online by Cambridge University Press:  09 March 2007

J. France ,
J. Dijkstra ,
M. S. Dhanoa ,
S. Lopez  and
A. Bannink
J. France*
Affiliation:
The University of Reading Department of Agriculture, PO Box 236, Earley Gate, Reading, RG6 6AT, UK
J. Dijkstra
Affiliation:
The University of Reading Department of Agriculture, PO Box 236, Earley Gate, Reading, RG6 6AT, UK
M. S. Dhanoa
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, SY23 3EB, UK
S. Lopez
Affiliation:
Department of Animal Production, University of Leon, 24007 Leon, Spain
A. Bannink
Affiliation:
Institute for Animal Science and Health (ID-DLO), PO Box 65, 8200 AB Lelystad, The Netherlands
*
*Corresponding author: Professor J. France, fax +44 (0)118 935 2421, email [email protected]
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Abstract

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Equations to describe gas production profiles, obtained using manual or automated systems for in vitro fermentation of ruminant feeds, were derived from first principles by considering a simple three-pool scheme. The pools represented were the potentially degradable and undegradable feed fractions, and accumulated gases. The equations derived and investigated mathematically were the generalized Mitscherlich, generalized Michaelis–Menten, Gompertz, and logistic. They were obtained by allowing the fractional rate of degradation to vary with time. The equations permit the extent of ruminal degradation (hence the supply of microbial protein to the duodenum) to be evaluated, thus linking the gas production technique to animal production.

Keywords

RumenGas productionMathematical models
Type
Research Article
Information
British Journal of Nutrition , Volume 83 , Issue 2 , February 2000 , pp. 143 - 150
Copyright
Copyright © The Nutrition Society 2000

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