Estimation of the energetic feed value obtained from chemical analysis and in vitro gas production using rumen fluid
01 Jan 1988-Vol. 28, pp 7-55
About: The article was published on 1988-01-01 and is currently open access. It has received 2370 citations till now.
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TL;DR: The techniques reported in this paper were developed to facilitate the study of the kinetics of forage digestion in vitro by measuring gas production by a modified NDF method that allows determination of extent of digestion at the end of an incubation in which gas production has been monitored.
546 citations
TL;DR: A review of the available in vitro gas measuring techniques used for feed evaluation with emphasis on assessing their relative advantages and disadvantages is given in this article, where the authors highlight the potential of gas techniques for tackling some interesting areas of research.
462 citations
TL;DR: A modified dual pool logistic equation, with a single lag value, was selected to model the in vitro digestion of these substrates and was able to predict adequately both the input composition and the kinetic parameters for a defined mixture and gave a good fit to data from all the single and mixed substrates tested.
Abstract: In vitro gas production, measured by computer-interfaced pressure sensors, was used to follow the digestion of a crystalline processed cellulose, a bacterial cellulose, and mixtures of these substrates by mixed ruminal bacteria. A first-order, substrate limited model (simple exponential with lag) and two bacterial growth models (logistic, Gompertz) were tested to fit these data. No single pool model gave an optimal fit to all substrates, but dual pool versions of both the logistic and Gompertz models fitted the data extremely well. Derivations of these models in the context of gas production are presented. The dual pool version of the exponential model commonly used to analyze fiber digestion was not able to reproduce the slope variations seen with mixed substrates. A modified dual pool logistic equation, with a single lag value, was selected to model the in vitro digestion of these substrates. The model was able to predict adequately both the input composition and the kinetic parameters for a defined mixture and gave a good fit (r2 > .995) to data from all the single and mixed substrates tested. This model may be useful for interpreting gas accumulation from natural feedstuffs.
434 citations
TL;DR: The relationship between plant genetics and silica metabolism is virtually uninvestigated, although reviews from plant physiology indicate it is a major factor in rice straw quality, which may contribute to higher straw value with rice yield.
428 citations
TL;DR: In this article, the relationship between in vitro true digestibility of dry matter (IVTD) and in vitro gas production was investigated and the influence of chemical constituents on gas and volatile fatty acid (VFA) was investigated.
357 citations