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- W4304127777 abstract "Prediction models for enteric methane (CH 4 ) emissions from beef cattle proposed by various groups may not perform with similar accuracy for the low- and middle-income countries in South-east Asia (SE-Asia) because beef cattle in these countries are raised under different climatic conditions with diverse feeding systems, and have different CH 4 emission characteristics. The objectives of this study were to: i) predict CH 4 emission (g d −1 animal −1 ), yield [g kg −1 dry matter intake; DMI) −1 ], intensity [g kg −1 average daily gain) −1 ], and CH 4 conversion factor ( Ym) using an intercountry database of individual animal records from SE-Asia; ii) evaluate the impact of different dietary forage contents (all-, high- and low-forage) representing the diverse feeding systems on CH 4 emission, yield, intensity and Ym in SE-Asia; and iii) cross-validate equations from this study with published data. A total of 398 individual animal observations of beef cattle from SE-Asia were used for this analysis. Linear models developed by incrementally adding covariates revealed that CH 4 emission model using only DMI fitted to all data had a root mean square prediction error (RMSPE) of 16.9%. Subsets containing data with 100% forage in the diet (all-forage), 50 to 85% (high-forage) and <50% (low-forage) had an RMSPE of 16.5, 14.7, and 17.4%, respectively. Linear multiple equation based on DMI and dietary NDF concentration (DMI + NDF_C, RMSPE = 15.2%; all-data) improved prediction accuracy over that of DMI alone. The DMI + NDF_C models for all-forage (RMSPE = 14.6%) and high-forage subsets (RMSPE = 13.3%) except for low-forage (RMSPE = 16.4%), improved the precision and accuracy of CH 4 emission prediction. Methane yield and CH 4 emission intensity could not be reliably modelled with the current database. The present study provides improved CH 4 prediction models for beef cattle managed under diverse feeding systems in SE-Asia and affirmed that region-specific models are needed to reliably predict beef cattle CH 4 emission at national or regional levels, particularly for low- and middle-income countries. • Beef cattle enteric methane emission models were developed based on SE-Asia data • Models developed for diets of 3 different forage contents • Region-specific models are needed to predict national livestock methane emissions" @default.
- W4304127777 created "2022-10-11" @default.
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- W4304127777 date "2022-12-01" @default.
- W4304127777 modified "2023-10-13" @default.
- W4304127777 title "Enteric methane emission models for diverse beef cattle feeding systems in South-east Asia: A meta-analysis" @default.
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- W4304127777 doi "https://doi.org/10.1016/j.anifeedsci.2022.115474" @default.
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