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Models for interpreting in vitro gas production profiles from ruminant foods

  • J. France (a1), S. Lopez (a2), J. Dijkstra (a3), R. Sanderson (a4) and M.S. Dhanoa (a4)...

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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.

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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.
Beuvink, J. M. W., Spoelstra, S. F. and Hogendorp, R. J. 1992. An automated method for measuring time-course of gas production of feedstuffs with buffered rumen fluid. Netherlands Journal of Agricultural Science 40: 401407.
Blümmel, M. and Ørskov, E. R. 1993. Comparison of in vitro gas production and nylon-bag degradability of roughage in predicting feed intake in cattle. Animal Feed Science and Technology 40: 109119.
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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.
Goering, M. K. and Van Soest, P. J. 1970. Forage fiber analysis (apparatus, reagents, procedures and some applications). Agricultural handbook no. 379. USDA Agricultural Research Service, Washington, DC.
Schofield, P., Pitt, R. E. and Pell, A. N. 1994. Kinetics of fiber digestion from in vitro gas production. Journal of Animal Science 72: 29802991.
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.

Models for interpreting in vitro gas production profiles from ruminant foods

  • J. France (a1), S. Lopez (a2), J. Dijkstra (a3), R. Sanderson (a4) and M.S. Dhanoa (a4)...

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