| Strategic treatment of anovular dairy cows with GnRH. | |
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MedLine Citation:
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PMID: 18926565 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The primary objective was to evaluate fertility of anovular dairy cows given GnRH 4 d after first postpartum timed AI (TAI). Secondary objectives were to determine ovulatory response to treatment, effect of treatment on serum progesterone (P(4)) concentrations, and the proportion with a short luteal phase. Lactating Holstein cows (n=1047) were submitted for first postpartum TAI using a Presynch+Ovsynch protocol. Anovular cows were identified from an initial 1047 lactating Holstein cows using transrectal ultrasonography, based on the absence of a CL at the first GnRH injection of a Presynch+Ovsynch protocol, and anovular cows were randomly assigned to receive either no further treatment (Control, n=85), or 100 microg of GnRH 4 d after TAI (GnRH treated; n=71). For GnRH treated cows, 51% responded by ovulating a follicle in response to GnRH treatment 4 d after TAI; however, pregnancies per AI (P/AI) did not differ between GnRH treated cows that ovulated (36%) compared to GnRH treated cows that did not ovulate (21%). There was a quadratic effect of P(4) at the PGF(2 alpha) injection of Ovsynch on P/AI, and cows with P(4)>or=1 ng/mL at the PGF(2 alpha) injection of Ovsynch had greater P/AI (41%) than cows with P(4)<1 ng/mL (12%); however, no treatment difference was detected. Overall, P/AI did not differ between control (30.1%) and GnRH treated (29.6%) treatments for synchronized cows. Although treatment of anovular cows with GnRH 4 d after TAI failed to improve fertility, variation among cows in serum P(4) at the PGF(2 alpha) injection of Ovsynch dramatically affected fertility of anovular dairy cows. |
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Authors:
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R A Sterry; E Silva; D Kolb; P M Fricke |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't Date: 2008-10-15 |
Journal Detail:
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Title: Theriogenology Volume: 71 ISSN: 0093-691X ISO Abbreviation: Theriogenology Publication Date: 2009 Feb |
Date Detail:
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Created Date: 2008-12-30 Completed Date: 2009-03-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0421510 Medline TA: Theriogenology Country: United States |
Other Details:
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Languages: eng Pagination: 534-42 Citation Subset: IM |
Affiliation:
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Department of Dairy Science, University of Wisconsin, Madison, WI 53706, United States. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Anovulation / veterinary* Cattle* Estrus Synchronization / drug effects Female Fertility Fertility Agents, Female / administration & dosage*, pharmacology* Gonadotropin-Releasing Hormone / administration & dosage*, pharmacology* Infertility Insemination, Artificial / veterinary Ovulation / drug effects Pregnancy Progesterone / blood |
| Chemical | |
Reg. No./Substance:
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0/Fertility Agents, Female; 33515-09-2/Gonadotropin-Releasing Hormone; 57-83-0/Progesterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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