An illustrative analysis of atypical gas production profiles obtained from in vitro digestibility studies using fecal inoculum

Mewa S. Dhanoa, Secundino López*, Christopher D. Powell, Ruth Sanderson, Jennifer L. Ellis, Jo Anne M.D. Murray, Anna Garber, Barbara A. Williams, James France

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)
104 Downloads (Pure)

Abstract

Gas production profiles typically show a monotonically increasing monophasic pattern. However, atypical gas production profiles exist whereby at least two consecutive phases of gas production or additional extraneous features that distort the typical profile are present. Such profiles are more likely to occur with the use of a fecal inoculum and are much less well described. The presence of multiple phases or non-descript extraneous features makes it difficult to apply directly recommended modeling approaches such as standard response functions or classical growth func-tions. To overcome such difficulties, extensions of the Mitscherlich equation and a numerical modeling option also based on the Mitscherlich are explored. The numerical modeling option uses an estimate of relative rate obtained from the smoothed data profile and an estimate of maximum gas produced together with any lag time information drawn from the raw data to construct a simple Mitscherlich equation. In summary, this article illustrates the analysis of atypical gas production profiles obtained using a fecal inoculum and explores the methodology of numerical modeling to reconstruct equivalent typical growth-like trends.

Original languageEnglish
Article number1069
Number of pages14
JournalAnimals
Volume11
Issue number4
DOIs
Publication statusPublished - 09 Apr 2021

Keywords

  • Atypical profiles
  • Equivalent profile construction
  • Feedstuff evaluation
  • Gas production technique
  • Mitscherlich equation
  • Numerical modeling

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