Cartographie de QTL et évaluation génomique chez la poule pondeuse dans un contexte alimentaire changeant

Abstract : The laying hens farming represents a growing market. The improvement of traits is needed to satisfy the willing of customers and industrials. This improvement is done with selection. Actually, (candidates for selection are evaluated according to their Estimated Breeding Value (EBV), which is estimated, using a statistic model which considers all the available phenotypes of their relative BLUP). The development of new technologies which allow the genotyping at a lower cost of numerous individuals, could allow the development of genomic selection in this farming. The Genomic Estimated Breeding Value (GEBV) could be potentially more accurate than the EBV, available at the birth of the individual and for probably a larger number of candidates, increasing the rates of genetic progress.Besides, a same genetic type of laying hens is widely distributed around the world, so animals produce in various environments ((alimentation, temperature, hygiene standards…). So, genotype – environment interactions could affect the estimation of breeding values of the candidates for selection. The first objective of this work is to determine of the impact of these interactions on a large panel of egg production and egg quality traits, as well at the genetic architecture level than at the evaluations level. Moreover, the consequences of genetic architecture of these traits on breeding value estimation have been studied.
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Hélène Romé. Cartographie de QTL et évaluation génomique chez la poule pondeuse dans un contexte alimentaire changeant. Sciences agricoles. Agrocampus Ouest, 2015. Français. ⟨NNT : 2015NSARB271⟩. ⟨tel-01361539⟩

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