Stoichiometric models for prediction of enteric methane production

Tadeu Silva de Oliveira; Alberto Magno Fernandes; Elizabeth Fonsêca Processi; Danielle Ferreira Baffa; Michele Gabriel Camilo

doi:10.14393/BJ-v38n0a2022-53647

Authors

Tadeu Silva de Oliveira Universidade Estadual do Norte do Rio de Janeiro https://orcid.org/0000-0001-7703-9323
Alberto Magno Fernandes Universidade Estadual do Norte Fluminense
Elizabeth Fonsêca Processi Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0001-8746-3080
Danielle Ferreira Baffa Universidade Estadual do Norte Fluminense
Michele Gabriel Camilo Universidade Estadual do Norte Fluminense https://orcid.org/0000-0003-1089-3589

DOI:

https://doi.org/10.14393/BJ-v38n0a2022-53647

Keywords:

Empirical evaluation, Predictive power, Short-chain fatty acids.

Abstract

This study aimed to empirically evaluate the adjustment quality of two stoichiometric models of methane production from diets that used different rumen fermentation modulators. We used the models proposed by Moss et al. (2000) and Blümmel et al. (1997). The data set consisted of 169 observations of in vitro methane production and volatile fatty acids (acetate, propionate, and butyrate) from dissertations, theses, and scientific articles. The model’s adequacy evaluation was only possible through combination of several statistical analyzes. The models were unable to predict the enteric methane precisely and accurately. Despite this, the model proposed by Moss et al. (2000) showed a better fit based on the mean bias (% of observed, MB), MEF, RMSEP, Cb and CCC measures compared to the model proposed by Blümmel et al. (1997). However, both models presented strong evidence against the general hypothesis H0: a = 0 & b = 1. Thus, the model proposed by MOSS et al. (2000) was more efficient, whereas the model by Blümmel et al. (1997) showed a better fit for diets with high availability of H2.

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