| Ovarian activity, transuterine embryo migration and prenatal losses in Ethiopian highland ewes. | |
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MedLine Citation:
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PMID: 18318351 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A study was conducted on 1442 Ethiopian highland ewes to determine the seasonality of ovarian activity, intrauterine embryo migration and prenatal reproductive wastage. Assessment of ovarian follicular activity revealed that a higher (p < 0.01) proportion of ewes ovulated in the dry season than in the heavy and light rainy seasons. However, there was a tendency (p = 0.057) of decline in the mean number of ovulations per ewes during the light rains. The mean diameter of the largest follicle on the ipsilateral ovary was higher (p < 0.01) in both ewes with single and those with twin corpora lutea (CL) than on the contralateral ovary; and, compared to ewes with single CL, it was higher (p < 0.05) in those with twin CL. The right ovary was more active (p < 0.001) only in single-ovulating ewes. Similarly, a higher (p < 0.001) proportion of ewes were pregnant in the right horn. Embryos migrated to the opposite horn in single-, twin- and triple-ovulating ewes. There was a higher (p < 0.001) tendency for the left-to-right migration than the opposite. There was significant (p < 0.01) association between embryo loss and site and number of ovulations. Embryo loss was higher (p < 0.01) in ewes with twin ovulations on the right ovary. It is very likely that these results indicate a better chance of embryo survival in the right uterine horn. |
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Authors:
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F Regassa; H Tamrat; M Bekana |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Tropical animal health and production Volume: 39 ISSN: 0049-4747 ISO Abbreviation: Trop Anim Health Prod Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2008-03-05 Completed Date: 2008-04-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1277355 Medline TA: Trop Anim Health Prod Country: United States |
Other Details:
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Languages: eng Pagination: 131-9 Citation Subset: IM |
Affiliation:
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Faculty of Veterinary Medicine, Debre-Zeit, Ethiopia. regassaf@yahoo.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abortion, Veterinary
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epidemiology* Animals Breeding Corpus Luteum / physiology Ethiopia Female Gestational Age Litter Size Ovarian Follicle / physiology* Ovary / anatomy & histology, physiology* Ovulation / physiology* Pregnancy Rain Seasons Sheep / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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