The influence of maternal effects on accuracy of evaluation of litter size in swine.

摘要: The influence of maternal genetic effects on response to selection was examined by stochastic simulation. process a closed herd 120 sows, with 24 boars entering the breeding each year, simulated over 10 yr. Effects different magnitudes heritability (0, .025, .05), correlations between and direct -5, -.9) evaluation models (with or without effects, referred as complete incomplete model) selection, accuracy evaluation, prediction error variance (PEV), bias, mean squared (MSE) were analyzed for litter size .lo. Directional replacement animals EBV first-parity under an animal model. Using model in increased magnitude (0 .05) from 2.22 2.32 pigs after yr, when there no correlation effects. Addi- tionally, positive achieved > O), although selec- tion EBV. Reduction due negative up 18% yr selection. More important mater- nal response, which -1.27 -.9. Consequently, overall merit (maternal plus direct) reduced 77% compared genetically independent. Estima- female values 36% more accurate than males. Estimates environmental trend, ignored (incomplete model), biased. Consideration recom- mended.