Document Detail

Intravaginal impedance and sexual behavior of ovariectomized goats given estrogen alone or in combination with progesterone.
MedLine Citation:
PMID:  17504954     Owner:  NLM     Status:  MEDLINE    
Intravaginal impedance (IVI) fluctuates during the goat estrous cycle. To understand which ovarian steroids are responsible for IVI changes and whether IVI variations are associated with precopulatory and copulatory behaviors, 8 ovariectomized females were assigned to 4 treatments in a 4 x 4 Latin square replicated over four 8-d periods. The treatments were as follows: progesterone plus estradiol-17beta (P4 + E2), oil plus estradiol-17beta (E2), progesterone plus oil (P4), or oil (OIL). Daily IVI measurements at the vagino-cervical junction were taken at 1 and 70 KHz. Progesterone was given on d 2 and 3. Estradiol was given in the evening of d 5. On d 1 to 8, goats were group-exposed to a sexually experienced male and observed for the expression of sexual behaviors. On d 6 and 7, IVI was less when goats received P4 + E2 or E2 compared with goats given P4 or OIL (P < 0.05). Impedance measured at 1 kHz tended to remain lower on d 8 in P4 + E2-treated females compared with those given P4 or OIL (P < 0.055). Like previous results, P4 + E2 or E2 treatment induced behavioral estrus; 5 of 8 P4 + E2-treated and 5 of 8 E2-treated females were sexually receptive on d 6. On d 7, although IVI remained low and 2 of 8 P4 + E2-treated goats and 4 of 8 E2-treated goats remained sexually receptive, no additional females were in estrus. No IVI decreases and no estrous behavior were observed in goats given P4 or OIL. This experiment demonstrated that E2 initiates the periestrous drop in IVI, and P4 may delay baseline return.
D B Imwalle; A R Lehrer; L S Katz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-05-15
Journal Detail:
Title:  Journal of animal science     Volume:  85     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-07-16     Completed Date:  2007-10-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1908-13     Citation Subset:  IM    
Department of Animal Sciences, Rutgers, The State University of New Jersey, New Brunswick 08901, USA.
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MeSH Terms
Drug Therapy, Combination
Estradiol / administration & dosage,  pharmacology*
Goats / physiology*
Progesterone / administration & dosage,  pharmacology*
Progestins / administration & dosage,  pharmacology*
Random Allocation
Sexual Behavior, Animal / drug effects*
Time Factors
Reg. No./Substance:
0/Progestins; 50-28-2/Estradiol; 57-83-0/Progesterone

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

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