TAILIEUCHUNG - Báo cáo khoa hoc:" A sampling method for estimating the accuracy of predicted breeding values in genetic evaluation"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: A sampling method for estimating the accuracy of predicted breeding values in genetic evaluation | Genet Sei. Evol. 33 2001 473-486 INRA EDP Sciences 2001 473 Original article a sampling method for estimating the accuracy of predicted breeding values in genetic evaluation Marie-Noelle Fouillouxa Denis Laloeb a Institut de l élevage Station de génétique quantitative et appliquée Institut national de la recherche agronomique Domaine de Vilvert 78352 Jouy-en-Josas cedex France b Station de génétique quantitative et appliquée Institut national de la recherche agronomique Domaine de Vilvert 78352 Jouy-en-Josas cedex France Received 15 November 2000 accepted 30 May 2001 Abstract - a sampling-based method for estimating the accuracy of estimated breeding values using an animal model is presented. Empirical variances of true and estimated breeding values were estimated from a simulated n-sample. The method was validated using a small data set from the Parthenaise breed with the estimated coefficient of determination converging to the true values. It was applied to the French Salers data file used for the 2000 on-farm evaluation IBOVAL of muscle development score. A drawback of the method is its computational demand. Consequently convergence can not be achieved in a reasonable time for very large data files. Two advantages of the method are that a it is applicable to any model animal sire multivariate maternal effects. and b it supplies off-diagonal coefficients of the inverse of the mixed model equations and can therefore be the basis of connectedness studies. genetic evaluation accuracy sampling methods 1. introduction The accuracy of predicted breeding values may be assessed by prediction error variance PEV . 16 or by other criteria which are functions of PEV such as the coefficient of determination CD . 17 also defined as the squared correlation between a true genetic merit and its estimate 4 25 . PEV and CD were first used to evaluate the accuracy of the estimated breeding value of each animal PEV . 10 26 CD . 4 25 27 . Then they were extended to .

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