Evaluation of nonadditive effects in yearling weight of tropical beef cattle

Journal of Animal Science
Fernanda S S RaidanAntonio Reverter

Abstract

Nonadditive effects may contribute to genetic variation of complex traits. Their inclusion in genetic evaluation models may therefore improve breeding value estimates and lead to more accurate selection decisions. In this study, we evaluated a systematic series of models accounting for additive, dominance and first-order epistatic interaction (additive by additive, GxG; additive by dominance, GxD; and dominance by dominance, DxD) on body yearling weight (YWT) of 2,550 Tropical Composite (TC) and 2,111 Brahman (BB) cattle in Australia. For both breeds, similar estimates of additive and phenotypic variances and narrow and broad-sense heritability values were obtained across the evaluated models except when GxG effect was considered. In this case, additive variance was slightly lower than that obtained in the models which do not consider this effect. The estimated dominance and epistatic variances from additive and dominance effects (AD) and additive, dominance and epistatic effects models (ADE) were greater than that ADH and ADEH models (as described above plus heterozygosity as a covariate). However, all genetic parameter estimates were associated with a large standard deviation. Averaged across ADH and ADHE models, the magnitud...Continue Reading

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Citations

Dec 24, 2019·Journal of Animal Science·C A Garcia-BaccinoZ G Vitezica
Feb 13, 2020·Journal of Animal Science·Antonio ReverterAndrés Legarra
Apr 28, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Seema YadavKai P Voss-Fels

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