Improving the prediction of methane production and representation of rumen fermentation for finishing beef cattle within a mechanistic model

J.L. Ellis, J. Dijkstra, A. Bannink, E. Kebreab, S. Archibeque, C. Benchaar, K. Beauchemin, D.J. Nkrumah, J. France

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The purpose of this study was to evaluate prediction of methane emissions from finishing beef cattle using an extant mechanistic model with pH-independent or pH-dependent VFA stoichiometries, a recent stoichiometry adjustment for the use of monensin, and adaptation of the underlying model structure, to see if prediction improvements could be made for beef cattle. The database used for independent evaluation of methane predictions consisted of 74 animal means from 6 studies. For the ‘Bannink’ stoichiometries, pH-dependence of stoichiometry improved the RMSPE statistic (38.8 to 36.6%) but the CCC statistic was reduced (0.509 to 0.469). Inclusion of monensin in the stoichiometry improved both pH-independent and pH-dependent predictions. For the ‘Murphy’ stoichiometries, pH-dependence worsened the RMSPE (31.2 to 33.7%) as well as the CCC (0.611 to 0.465) statistic. Inclusion of monensin in the stoichiometry improved predictions with the pH-independent but not with the pH-dependent stoichiometry. Results indicate that although improvements have been made to the mechanistic model, further improvement in the representation of VFA stoichiometry, and likely the representation and prediction of pH and NDF digestibility, are required for more accurate prediction of methane emissions for finishing beef cattle. However, inclusion of an adjustment for monensin feeding generally lead to improved methane predictions.
Original languageEnglish
Pages (from-to)509-524
JournalCanadian Journal of Animal Science
Volume94
Issue number3
DOIs
Publication statusPublished - 2014

Keywords

  • high-concentrate diets
  • microbial protein-synthesis
  • odorous compound production
  • dry-matter intake
  • dairy-cows
  • enteric methane
  • in-vitro
  • gas-production
  • lactating cow
  • nutrient digestibility

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