Document Detail


Effect of the regressing corpus luteum of pregnancy on ovarian folliculogenesis after parturition in cattle.
MedLine Citation:
PMID:  11804938     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In cattle, the first postpartum dominant follicle has a predilection for the ovary contralateral to the previously gravid uterine horn, possibly due to a local inhibitory effect of the regressing corpus luteum of pregnancy in the ipsilateral ovary. The aim of the present study was to test the hypothesis that the regressing corpus luteum of pregnancy suppresses folliculogenesis in the ipsilateral ovary after parturition. Dairy cows were treated with prostaglandin F2alpha between 190 and 220 days of gestation to cause luteolysis without inducing parturition (n = 14) or were untreated controls (n = 32). Follicular growth and function were monitored by daily transrectal ultrasonography and collection of plasma samples for estimation of FSH, estradiol, and progesterone concentrations. The proportion of first dominant follicles in the ipsilateral ovary was similar for treated and control animals (4/14 vs. 8/32), as was the time interval between calving and establishment of a dominant follicle (mean +/- SEM, 10.1 +/- 0.4 vs. 10.7 +/- 0.5 days). Furthermore, no significant effect of treatment on dominant follicle growth or function was found as determined by plasma hormone concentrations. Although greater folliculogenesis was found in the ovary contralateral to the previously gravid uterine horn, once the location of the future first dominant follicle was selected, the timing of events was independent of location. We suggest that the corpus luteum of pregnancy does not have a local effect on postpartum ovarian folliculogenesis and that, instead, an effect of the previously gravid uterine horn shortly after parturition should be considered.
Authors:
I Martin Sheldon; David E Noakes; Hilary Dobson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biology of reproduction     Volume:  66     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-01-23     Completed Date:  2002-04-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  266-71     Citation Subset:  IM    
Affiliation:
Department of Farm Animal and Equine Medicine and Surgery, Royal Veterinary College, University of London, Hatfield AL9 7TA, United Kingdom. msheldon@rvc.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Animals
Cattle
Corpus Luteum / physiology*,  ultrasonography
Dinoprost / pharmacology
Estradiol / blood
Female
Follicle Stimulating Hormone / blood
Hormones / blood
Labor, Obstetric / physiology*
Ovarian Follicle / physiology*,  ultrasonography
Pregnancy
Progesterone / blood
Chemical
Reg. No./Substance:
0/Hormones; 50-28-2/Estradiol; 551-11-1/Dinoprost; 57-83-0/Progesterone; 9002-68-0/Follicle Stimulating Hormone

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