Document Detail

Seasonal variation of the ovarian follicular dynamics and luteal functions of sheep in the subtropics.
MedLine Citation:
PMID:  16439009     Owner:  NLM     Status:  MEDLINE    
This study was undertaken to describe the development of individual follicles and corpora lutea (CL) in Ossimi ewe lambs at different seasons of the year in the subtropics. Seven ewe lambs underwent daily ultrasonographic examination for 20 interovulatory periods (IOP) during spring, winter and autumn. Ovarian follicles >or=2 mm and corpora lutea were counted and measured. Blood samples were taken for progesterone (P(4)) analysis. All ewe lambs included, but one, were cyclic in all seasons studied. Three (65%) and two (35%) follicular waves were detected per estrous cycle. None of the characteristics of the large follicles was affected by season. Follicles >or=2 mm in diameter were significantly higher in winter. The CL developed slowly in autumn. Serum P(4) level was higher in autumn. Double ovulation was observed only in autumn. The data demonstrated that Ossimi sheep in the subtropics were cyclic in most seasons of the year. Season affected mainly the luteal functions with little influences on the follicular characteristics.
A Ali; R Derar; H Hussein
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Publication Detail:
Type:  Journal Article     Date:  2006-01-24
Journal Detail:
Title:  Theriogenology     Volume:  66     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-26     Completed Date:  2007-07-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  463-9     Citation Subset:  IM    
Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, Assiut 71526, Egypt.
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MeSH Terms
Corpus Luteum / physiology*,  ultrasonography
Estrus / blood,  physiology*
Luteal Phase
Ovarian Follicle / physiology*,  ultrasonography
Progesterone / blood
Sheep / physiology*
Time Factors
Tropical Climate
Reg. No./Substance:

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