Document Detail

Effect of timing of progesterone administration on pregnancy rate after embryo transfer in ovariectomized mares.
MedLine Citation:
PMID:  3479599     Owner:  NLM     Status:  MEDLINE    
Ovariectomized recipient mares were divided into two groups. Group A mares received 300 mg progesterone in oil i.m. daily starting 5 days before transfer of a 7-day embryo. Group B mares received the same dose of progesterone, but starting at least 4 days before donor ovulation. Presence of an embryonic vesicle was determined by ultrasonography; mares were considered to be pregnant if they had normal vesicle development to Day 18. Pregnancy rates were: Group A, 6/8; Group B, 1/12 (P less than 0.01). An additional 4 mares in Group B had a vesicle visible at 14 days which degenerated or did not grow. These results indicate that, for establishment of pregnancy after embryo transfer, there is a need for synchrony of donor ovulation with onset of progesterone administration to ovariectomized recipient mares.
K Hinrichs; R M Kenney
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of reproduction and fertility. Supplement     Volume:  35     ISSN:  0449-3087     ISO Abbreviation:  J. Reprod. Fertil. Suppl.     Publication Date:  1987  
Date Detail:
Created Date:  1988-01-21     Completed Date:  1988-01-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0225652     Medline TA:  J Reprod Fertil Suppl     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  439-43     Citation Subset:  IM    
Section of Reproductive Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, Kennett Square 19348.
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MeSH Terms
Embryo Transfer / veterinary*
Horses / physiology*
Pregnancy, Animal / drug effects*
Progesterone / administration & dosage,  pharmacology*
Time Factors
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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