| The estrous cycle of the ewe is resistant to disruption by repeated, acute psychosocial stress. | |
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MedLine Citation:
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PMID: 20164438 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Five experiments were conducted to test the hypothesis that psychosocial stress interferes with the estrous cycle of sheep. In experiment 1, ewes were repeatedly isolated during the follicular phase. Timing, amplitude, and duration of the preovulatory luteinizing hormone (LH) surge were not affected. In experiment 2, follicular-phase ewes were subjected twice to a "layered stress" paradigm consisting of sequential, hourly application of isolation, restraint, blindfold, and predator cues. This reduced the LH pulse amplitude but did not affect the LH surge. In experiment 3, different acute stressors were given sequentially within the follicular phase: food denial plus unfamiliar noises and forced exercise, layered stress, exercise around midnight, and transportation. This, too, did not affect the LH surge. In experiment 4, variable acute psychosocial stress was given every 1-2 days for two entire estrous cycles; this did not disrupt any parameter of the cycle monitored. Lastly, experiment 5 examined whether the psychosocial stress paradigms of experiment 4 would disrupt the cycle and estrous behavior if sheep were metabolically stressed by chronic food restriction. Thirty percent of the food-restricted ewes exhibited deterioration of estrous cycle parameters followed by cessation of cycles and failure to express estrous behavior. However, disruption was not more evident in ewes that also encountered psychosocial stress. Collectively, these findings indicate the estrous cycle of sheep is remarkably resistant to disruption by acute bouts of psychosocial stress applied intermittently during either a single follicular phase or repeatedly over two estrous cycles. |
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Authors:
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Elizabeth R Wagenmaker; Kellie M Breen; Amy E Oakley; Alan J Tilbrook; Fred J Karsch |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-02-17 |
Journal Detail:
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Title: Biology of reproduction Volume: 82 ISSN: 1529-7268 ISO Abbreviation: Biol. Reprod. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-24 Completed Date: 2010-08-31 Revised Date: 2011-07-28 |
Medline Journal Info:
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Nlm Unique ID: 0207224 Medline TA: Biol Reprod Country: United States |
Other Details:
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Languages: eng Pagination: 1206-15 Citation Subset: IM |
Affiliation:
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Department of Molecular and Integrative Physiology and Reproductive Sciences Program, University of Michigan, Ann Arbor, MI 48109, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blindness / psychology Estrous Cycle / physiology* Female Follicular Phase / blood, psychology Luteinizing Hormone / blood Progesterone / blood Restraint, Physical / psychology Sheep / physiology* Social Isolation / psychology Stress, Psychological / physiopathology* |
| Grant Support | |
ID/Acronym/Agency:
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HD051360/HD/NICHD NIH HHS; HD30773/HD/NICHD NIH HHS; K99 HD060947-01A1/HD/NICHD NIH HHS; K99 HD060947-02/HD/NICHD NIH HHS |
| Chemical | |
Reg. No./Substance:
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57-83-0/Progesterone; 9002-67-9/Luteinizing Hormone |
| Comments/Corrections | |
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