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Master Thesis

Analyse du gène Lacaune d'hyperprolificité dans la population Lacaune Viande Ovi-Test

Abstract : The major gene of prolificacy FecL (or Lacaune gene) has been discovered in the Lacaune Ovi-Test meat sheep population in the beginning of the 2000's. The cooperative Ovi-test chose to manage this gene at heterozygous state in its selection nucleus and, since 2010, every replacement ewe lamb is genotyped for FecL. The large accumulated amount of data allowed to better estimate the genotypic frequencies and the gene effect on prolificacy, so as testing potential gene effect on other traits. The heterozygous ewes (L+) have a prolificacy higher by 0.5 and a higher litter size variability than the homozygous wild ewes (++). Their AI fertility is higher too for some categories of animals. On the contrary, lambs from ++ dams are heavier at 30 days (+300 g) than lambs from L+ dams and have a smaller mortality rate for the twin lambs category. Such effects have never already been observed for other major genes of prolificacy. A bias due to the major gene has been evidenced too in the calculation of the prolificacy EBV and this problem may disturb the selection process. Moreover, an analysis of the inseminations made since 2010 led to the identification of a software problem. With all these results, the FecL gene effects are better known, even if lots of them are not explicated for the moment. This can lead to changes in the strategies or ways of working of the cooperative.
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Master Thesis
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Submitted on : Tuesday, December 3, 2013 - 2:05:52 PM
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Pauline Martin. Analyse du gène Lacaune d'hyperprolificité dans la population Lacaune Viande Ovi-Test. Sciences agricoles. 2013. ⟨dumas-00913211⟩

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