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Détection de QTL et sélection génomique des qualités maternelles des vaches allaitantes

Abstract : Reproduction, calving and milking performance of beef cows are included in maternal performance which are of major economic importance for beef cattle breeding. Beef cattle selection schemes use the progeny station tool to measure these phenotypes for the selection of the best insemination bulls. This coupled with the rapid ease of access to beef cattle genomic information, creates new opportunities for a more efficient selection of maternal performance. In this study, near 2 000 females with individual maternal performance were genotyped with low density chip (7 660 SNP) in two beef breeds, Blonde d'Aquitaine and Limousine. The genotypes were imputed in high density (more than 700 000 SNP). QTL detection was performed within breed with a Bayesian approach to test the association of the imputed genotypes and the performance. Among the QTL regions identified, a total of 41 candidate genes were proposed for sexual precocity (6), calving (11), milk performance (21) and maternal behavior (3). Several genomic selection methods were compared for maternal performance traits in Blonde d'Aquitaine breed. Minor differences of accuracy were found between single-trait evaluation methods. The "Single Step Genomic BLUP" multi-trait combining records from station and farm gave the more accurate genetic values for sorting bulls. Several genomic values accuracy improvements were proposed. The conditions of use of these indexes and the evolution of the selection scheme of maternal traits and the related tools are discussed.
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  • HAL Id : tel-02923447, version 1

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Alexis Michenet. Détection de QTL et sélection génomique des qualités maternelles des vaches allaitantes. Génétique animale. Université Paris Saclay (COmUE), 2016. Français. ⟨NNT : 2016SACLA008⟩. ⟨tel-02923447⟩

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