| Decreased superovulatory responses in heifers superovulated in the presence of a dominant follicle. | |
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MedLine Citation:
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PMID: 1995865 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Dairy heifers were superovulated in the presence (dominant group, N = 8) or absence (non-dominant group, N = 6) of a dominant follicle at the start of a a superovulatory treatment on Days 7-12 of the oestrous cycle (Day 0 = oestrus). Daily ultrasonographic observations of ovaries (recorded on videotape) starting on Day 3 were used to assess the presence or absence of a dominant follicle (diameter greater than 9 mm, in a growing phase or at a stable diameter for less than 4 days) and to monitor follicular development before and during treatment. The number of CL estimated by ultrasonography (7.1 +/- 1.8 vs 13.5 +/- 1.4) or by rectal palpation (6.9 +/- 2.0 vs 16.3 +/- 1.6) and mean progesterone concentrations (32.5 +/- 19 vs 80.7 +/- 16 ng/ml) after treatment were lower (P less than 0.01) in the dominant than in the non-dominant group. Based on number of CL, two populations of heifers were identified in the dominant group, i.e. those that had a high (dominant-high, N = 4; greater than 7 CL) or a low (dominant-low, N = 4; less than 7 CL) response to treatment. During treatment, the increases in number of follicles 7-10 mm and greater than 10 mm in diameter occurred sooner and were of higher magnitude in the non-dominant than in the dominant-high or dominant-low groups (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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L A Guilbault; F Grasso; J G Lussier; P Rouillier; P Matton |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of reproduction and fertility Volume: 91 ISSN: 0022-4251 ISO Abbreviation: J. Reprod. Fertil. Publication Date: 1991 Jan |
Date Detail:
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Created Date: 1991-03-26 Completed Date: 1991-03-26 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376367 Medline TA: J Reprod Fertil Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 81-9 Citation Subset: IM |
Affiliation:
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Agriculture Canada Research Station, Lennoxville, Quebec, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle / physiology* Corpus Luteum / physiology, ultrasonography Female Ovarian Follicle / growth & development, physiology*, ultrasonography Progesterone / blood Superovulation / physiology* |
| Chemical | |
Reg. No./Substance:
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57-83-0/Progesterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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