Characterization of dairy cows carrying ''fertil+/+'' or ''fertil-/-'' haplotype for one QTL of female fertility located on the chromosome 3

Abstract : Over the last decade, the fertility of high producing dairy cows has been continuously damaged, especially in the Holstein breed. This decrease of fertility is related, in part, to the intensity of selection on milk production. Studies realised by geneticists allowed the detection of several QTL (Quantitative trait locus) for female fertility in the dairy cow. In the present work, homozygous animals for the favourable haplotype "fertil +/+" were compared to homozygous for the unfavourable haplotype "fertil -/-". "Fertil+/+" and "fertil-/-" are the haplotypes of one QTL of female fertility located on chromosome 3 (QTL-F-Fert-BTA3) that is involved in early pregnancy failures. Various parameters were studied on 45 heifers and then on 41 first lactating cows. We observed that "fertil-/-" cows lost more weight during the first 7 weeks after calving than "fertil+/+" cows. During this period, milk production and dry matter intake were lower for "fertil-/-" than "fertil+/+" cows. Progesterone profiles revealed that "fertil+/+" cows had their first oestrus cycle after calving earlier than "fertil-/-" cows. We finally noted that the success of the first artificial insemination was higher for "fertil+/+" than "fertil-/-" animals. The higher body weight loss observed after calving in "fertil-/-" cows could explain the delayed time to resume ovarian cyclicity after parturition and their lower fertility compared to "fertil+/+" cows.
Type de document :
Communication dans un congrès
XIème Symposium International sur la Physiologie des Ruminants, Sep 2009, Clermont Ferrand (FR), France
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https://hal-agrocampus-ouest.archives-ouvertes.fr/hal-00730142
Contributeur : Céline Martel <>
Soumis le : vendredi 7 septembre 2012 - 16:11:19
Dernière modification le : mercredi 21 mars 2018 - 16:08:10

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  • HAL Id : hal-00730142, version 1

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S. Coyral-Castel, C. Ramé, C. Fabre-Nys, D. Monniaux, P. Monget, et al.. Characterization of dairy cows carrying ''fertil+/+'' or ''fertil-/-'' haplotype for one QTL of female fertility located on the chromosome 3. XIème Symposium International sur la Physiologie des Ruminants, Sep 2009, Clermont Ferrand (FR), France. 〈hal-00730142〉

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