| Seasonal variation of reproductive performance, foetal development and progesterone concentrations of sheep in the subtropics. | |
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MedLine Citation:
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PMID: 18537909 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim of the present study was to investigate the effect of breeding season [late spring (LSP) vs winter (WIN)] on reproductive performances, foetal development and progesterone (P(4)) concentrations of sheep in the subtropics. Ewes of Farafra breed were exposed for mating in LSP (n = 79) and WIN (n = 45). Ultrasonographic examinations were performed at days 25, 45 and 75 of mating to estimate the pregnancy rate, incidence of twinning and percentage of foetal losses. Foetal growth rate was determined at 10-day interval, and blood samples were taken on days 0 (oestrus), 8, 18 of oestrous cycle and on days 30, 45, 60 and 90 of pregnancy for P(4) analysis. The results showed that pregnancy and lambing rates were greater (p < 0.01) for ewes mated in LSP (93.7% and 92.4%) than for those mated in WIN (75.6% and 71.1%), respectively. There was no effect of season on the incidence of twinning (overall 19.1%) or the frequency of foetal losses (overall 7.3%). Transient reduction of placental size, foetal growth and P(4) concentration was observed following LSP matings. In conclusion, pregnancy and lambing rates were higher following LSP matings. Summer heat stress of the late spring mated ewes transiently interferes with foetal growth and P(4) concentrations. |
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Authors:
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A Ali; M Hayder |
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Publication Detail:
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Type: Journal Article Date: 2008-06-04 |
Journal Detail:
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Title: Reproduction in domestic animals = Zuchthygiene Volume: 43 ISSN: 1439-0531 ISO Abbreviation: Reprod. Domest. Anim. Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-12-10 Completed Date: 2009-03-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9015668 Medline TA: Reprod Domest Anim Country: Germany |
Other Details:
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Languages: eng Pagination: 730-4 Citation Subset: IM |
Affiliation:
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Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt. ahmedali77@hotmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Breeding / methods Embryo Loss / epidemiology, etiology, veterinary Estrus / blood* Female Fetal Development / physiology* Litter Size Pregnancy Pregnancy Rate Pregnancy, Animal / blood, physiology* Progesterone / blood* Reproduction / physiology* Risk Factors Seasons Sheep / blood, embryology, physiology* Tropical Climate |
| 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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