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To assess the benefits of incorporating fat thickness in residual feed intake estimation in beef cattle.

February 26, 2026

Contribution of Fat Adjustment to Residual Feed Intake Estimation in Beef Cattle.

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To assess the benefits of incorporating fat thickness in residual feed intake estimation in beef cattle.
Analyzed phenotypic records from 9094 Nellore animals over 14 feed efficiency tests.
Estimated genetic correlations using genomic information and applied linear and threshold animal models.
Computed accuracy, bias and dispersion of genomic breeding values for adjusted and unadjusted RFI.
Heritability estimates for RFI with and without fat adjustment were low (0.16 and 0.17 respectively).
Strong genetic correlation between adjusted and unadjusted RFI values (0.98).
Prediction accuracy was similar for both RFI measures (~0.43 for RFI_F and ~0.44 for RFI_W).
Minor differences in bias and dispersion were observed between the two measures.

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This analysis finds fat adjustment improves residual feed intake predictions in beef cattle, suggesting better selection strategies.

Temp et al. (2026) studied this question.

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