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- W1517463313 abstract "This study quantified the efficiency of quantitative traits loci (QTL)-assisted selection in the presence of correlations (ρqr) between identified (q) and residual (r) genotypes. Two levels of heritability (h² = 0.1 or 0.3), two levels of correlation (ρqr = -0.3 or 0.3) and five proportions of genetic variance explained by QTL detected ([graphic removed] = 0.1, 0.2, 0.4, 0.6 or 0.8) were combined to give 20 scenarios in all. QTL-assisted selection placed a larger index weight on the QTL genotype than on the phenotype in 17 of 20 scenarios, yielding a greater response in the QTL genotype than in residual genotype. Although QTL-assisted selection was superior to phenotypic selection in all 20 scenarios, QTL-assisted selection showed a greater advantage over phenotypic selection when ρqr was positive than when ρqr was negative. Doubling the proportion of detected QTL variance to genetic variance does not result in a twofold increase in the genetic response to QTL-assisted selection, suggesting that economic returns diminish for each additional cost of detecting extra QTL. The correlation between q and r would make the interpretation (or prediction) of QTL effects difficult and QTL-assisted selection strategy must consider the joint effect of q and r. When q and r are not independent, a failure to account for ρqr in QTL-assisted selection would underestimate the genetic responses when ρqr is positive, but overestimate the genetic responses when ρqr is negative. Estimation bias is more serious at high heritability than at low heritability. Accounting for ρqr would improve the efficiency of QTL-assisted selection and the accuracy of QTL detection. The generalized procedure developed in this study allows for quantifying the efficiency of QTL-assisted selection and assessing estimation bias for ignoring the correlation between q and r for all possible combinations of h², ρqr, and [graphic removed] ." @default.
- W1517463313 created "2016-06-24" @default.
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- W1517463313 date "2008-01-09" @default.
- W1517463313 modified "2023-09-25" @default.
- W1517463313 title "Efficiency of quantitative trait loci-assisted selection in correlations between identified and residual genotypes" @default.
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- W1517463313 doi "https://doi.org/10.1111/j.1740-0929.2007.00493.x" @default.
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