Technical note: A proposed method to determine the extent of degradation of a feed in the rumen from the degradation profile obtained with the in vitro gas production technique using feces as the inoculum

Authors Organisations
  • L. A. Crompton(Author)
  • Sophie Lopez(Author)
  • R. M. Mauricio(Author)
  • M. S. Dhanoa(Author)
  • Ruth Sanderson(Author)
  • J. A. N. Mills(Author)
  • E. Kebreab(Author)
  • Jan Dijkstra(Author)
  • Jim France(Author)
Type Article
Original languageEnglish
Pages (from-to)733-746
Number of pages14
JournalJournal of Animal Science
Issue number3
Publication statusPublished - 2004
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A method is proposed to determine the extent of degradation in the rumen involving a two stage mathematical modeling process. In the first stage, a statistical model shifts (or maps) the gas accumulation profile obtained using a fecal inoculum to a ruminal gas profile. Then, a kinetic model determines the extent of degradation in the rumen from the shifted profile. The kinetic model is presented as a eneralized mathematical function, allowing any one of a number of alternative equation forms to be selected. This method might allow the gas production technique to become an approach for determining extent of degradation in the rumen, decreasing the need for surgically modified animals while still maintaining the link with the animal. Further research is needed before the proposed methodology can be used as a standard method across a range of feeds.