| Ovarian parameters and fertility of dairy cows selected for one QTL located on BTA3. | |
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MedLine Citation:
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PMID: 21196034 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Recently, one Quantitative Trait Locus (QTL) of female fertility located on Bos Taurus chromosome 3 (BTA3), QTL-F-Fert-BTA3, has been identified in Holstein breed. It is implied in the success rate after the first AI (AI1) in cow. The failure of pregnancy can be due to several factors involved in the different steps of the reproductive process. The aim of our study was to finely phenotype heifers and primiparous cows selected for their haplotype at the QTL-F-Fert-BTA3. We specifically studied the ovarian follicular dynamic and several fertility parameters. Females carrying the favourable haplotype "fertil+" or unfavourable haplotype "fertil-" were monitored by transrectal ultrasonography during their cycle before the first AI (AI1). Follicular dynamic was similar between the two groups. However, the length of the estrus cycle was shorter in heifers than in primiparous cows and two-wave cycles were shorter than three-wave cycles, regardless of the age and the haplotype. The concentration of plasma anti-Müllerian hormone was correlated with the number of small antral follicles. It was higher in heifers than in primiparous cows, independently of their haplotype. The success rate at the AI1 was significantly higher in "fertil+" than in "fertil-" primiparous cows, 35 d after the AI1 (70% vs 39%). In both haplotypes, pregnancy failure occurred mainly before 21 d after AI1. The commencement of luteal activity after calving was significantly earlier in "fertil+" than in "fertil-" primiparous cows. Calving-AI1 and calving-calving intervals were similar between "fertil+" and "fertil-" primiparous cows. Taken together, "fertil+" and "fertil-" primiparous cows present a difference in the success rate after AI1 that is not explained by variations of ovarian dynamics. |
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Authors:
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S Coyral-Castel; C Ramé; D Monniaux; S Fréret; C Fabre-Nys; S Fritz; P Monget; F Dupont; J Dupont |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2010-12-31 |
Journal Detail:
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Title: Theriogenology Volume: - ISSN: 1879-3231 ISO Abbreviation: - Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2011-1-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0421510 Medline TA: Theriogenology Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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INRA, UMR85 Physiologie de la Reproduction et des Comportements, 37380 Nouzilly, France; Institut de l'Elevage, département Génétique, 149 rue de Bercy, 75595 Paris cedex 12, France. |
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