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Master Thesis

Optimisation de l'évaluation de la prolificité pour la race Tai Zumu

Abstract : The performances of sows vary on the first 3 rows of career, complicating the work of selection of the breeders. Heritabilities and genetic parameters for the average number of piglets born alive on various rows, as well as for the new criteria, the sums and the variations of the performances been born alive on rows 1 and 2 or on rows 2 and 3, were estimated by the restricted maximum likelihood method. The population studied corresponds to 3554 sows born after the 7th January 2004 and having realized 3 rows of reach before the 16th February 2015. The criterion delta21, defined as the difference of performance between rows 1 and 2, has an heritability of 6%, and its absolute value, has an heritability of 5%, they translate the capacity of the sow to improve or repeat its performances. The criterion somme12, defines as the sum of the performances on the first 2 rows, has an heritability of 26% and translates the potential of prolificacy for the beginning of career. The estimations of the genetic correlations, between the different prolificacy criteria, allowed to highlight 4 scenarios which can potentially answer the problematic and integrate these new criteria. They are compared with a reference scenario appropriate to the study and approaching the current selection in Tai Zumu. The criterion delta21 or its absolute do not allow to optimize the evaluation but bring an additional information. The criterion somme12 requires to delay the selection of a cycle and thus to revise the evaluation in its globality.
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  • HAL Id : dumas-01298576, version 1

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Mélanie Rui. Optimisation de l'évaluation de la prolificité pour la race Tai Zumu . Sciences agricoles. 2015. ⟨dumas-01298576⟩

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