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A comparison of the suitability of different models for describing the gas production kinetics of whole-crop wheat

  • A. T. Adesogan (a1) (a2), E. Owen (a1) and D. I. Givens (a2)

Extract

Menke et al. (1979), Beuvink et al. (1992) and Theodorou et al. (1994) developed techniques for measuring the time course of gas production of foods fermented in vitro with rumen fluid. These techniques require description of the fermentation profile with an appropriate mathematical model. Although several authors have used these techniques to study the ruminal fermentation of foods, little information is available on the suitability of the model chosen for describing the fermentation profile of the food under study. In this study, the models of Ørskov and McDonald (1979), France et al. (1993) and Beuvink and Kogut (1993) were fitted to the in vitro gas production profiles of 10 whole-crop wheat (WCW) forages (cv. Slepjner) to determine the model most suited to describing the data.

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Beuvink, J. M. W. and Kogut, J. 1993. Modelling gas production kinetics of grass silages incubated with buffered rumen 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 incubated with buffered rumen fluid. Netherlands Journal of Agricultural Science 40: 401407.
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.
Lavrenčič, A., Stefanon, B. and Susmel, P. 1997. An evaluation of the Gompertz model in degradability studies of forage chemical components. Animal Science 64: 423431.
Menke, K. H., Raab, L., Salewski, A., Steingass, H., Fritz, D. and Schneider, W. 1979. The estimation of the digestibility and metabolisable energy content of ruminant feedingstuffs from the gas production when they are incubated with rumen liquor in vitro . Journal of Agricultural Science, Cambridge 93: 217222.
Ørskov, E. R. and McDonald, I. 1979. The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. Journal of Agricultural Science, Cambridge 92: 499503.
Theodorou, M. K., Barbara, A. W., 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.

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