Causes of inaccurate prediction of volatile fatty acids by simulation models of rumen function in lactating cows

Journal of Theoretical Biology
A BanninkJ France

Abstract

Extant mechanistic models of rumen functions are unable to predict the molar proportion of volatile fatty acids (VFA) accurately. In order to make these models useful in investigating theories on nutrient flows that go beyond the rumen, the representations adopted need to be improved. This theoretical study was directed at identifying what parts of a rumen model may be responsible for the inaccurate VFA prediction. For five distinct parts of a model, not involving the description of the microbiological metabolism, the hypothesis was tested that their inappropriate description can be a probable cause of inaccurate VFA prediction. These five parts were: (1) the input functions of feed ingestion; (2) the representation of insoluble, degradable substrate of roughage and concentrate origin; (3) the kinetics of VFA absorption from the rumen; (4) the VFA coefficients that describe the stoichiometry of the conversion of fermented substrate into VFA; and (5) the representation of the rumen particle dynamics. Every hypothesis was tested by modifying the model description and simulating it to steady state. Observations required were derived from digestion trials with lactating dairy cows. Simulation results demonstrated that the predicted...Continue Reading

Citations

Nov 26, 2013·Journal of Dairy Science·S GhimireM D Hanigan
Mar 6, 2017·Journal of Dairy Science·S GhimireM D Hanigan
Mar 11, 2006·Journal of Dairy Science·M D HaniganJ P McNamara
Apr 17, 2013·Journal of Dairy Science·M D HaniganP Gregorini
Nov 16, 2019·Annual Review of Animal Biosciences·Mark D Hanigan, Veridiana L Daley
Sep 30, 2008·Journal of Animal Science·E KebreabJ France
May 29, 2015·Journal of Animal Science·M A Sarhan, K A Beauchemin
Jan 24, 2021·The Science of the Total Environment·Ronaldo VibartFrancisco Salazar

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