Document Detail

Ovarian activity, transuterine embryo migration and prenatal losses in Ethiopian highland ewes.
MedLine Citation:
PMID:  18318351     Owner:  NLM     Status:  MEDLINE    
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.
F Regassa; H Tamrat; M Bekana
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Tropical animal health and production     Volume:  39     ISSN:  0049-4747     ISO Abbreviation:  Trop Anim Health Prod     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2008-03-05     Completed Date:  2008-04-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1277355     Medline TA:  Trop Anim Health Prod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  131-9     Citation Subset:  IM    
Faculty of Veterinary Medicine, Debre-Zeit, Ethiopia.
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MeSH Terms
Abortion, Veterinary / epidemiology*
Corpus Luteum / physiology
Gestational Age
Litter Size
Ovarian Follicle / physiology*
Ovary / anatomy & histology,  physiology*
Ovulation / physiology*
Sheep / physiology*

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