| Voluntary exercise at the expense of reproductive success in Djungarian hamsters (Phodopus sungorus). | |
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MedLine Citation:
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PMID: 20676598 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Energy demands of gestation and lactation represent a severe challenge for small mammals. Therefore, additional energetic burdens may compromise successful breeding. In small rodents, food restriction, cold exposure (also in combination) and wheel running to obtain food have been shown to diminish reproductive outcome. Although exhibited responses such as lower incidence of pregnancy, extended lactation periods and maternal infanticide were species dependent, their common function is to adjust energetic costs to the metabolic state reflecting the trade-off between maternal investment and self-maintenance. In the present study, we sought to examine whether voluntary exercise affects reproduction in Djungarian hamsters (Phodopus sungorus), which are known for their high motivation to run in a wheel. Voluntary exercise resulted in two different effects on reproduction; in addition to increased infanticide and cannibalism, which was evident across all experiments, the results of one experiment provided evidence that free access to a running wheel may prevent successful pregnancy. It seems likely that the impact of voluntary wheel running on reproduction was associated with a reduction of internal energy resources evoked by extensive exercise. Since the hamsters were neither food-restricted nor forced to run in the present study, an energetic deficit as reason for infanticide in exercising dams would emphasise the particularly high motivation to run in a wheel. |
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Authors:
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Ines Petri; Frank Scherbarth; Stephan Steinlechner |
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Publication Detail:
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Type: Journal Article Date: 2010-07-31 |
Journal Detail:
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Title: Die Naturwissenschaften Volume: 97 ISSN: 1432-1904 ISO Abbreviation: Naturwissenschaften Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-30 Completed Date: 2011-01-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0400767 Medline TA: Naturwissenschaften Country: Germany |
Other Details:
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Languages: eng Pagination: 837-43 Citation Subset: IM |
Affiliation:
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Institute of Zoology, University of Veterinary Medicine Hannover, Buenteweg 17, 30559, Hannover, Germany. ines.petri@tiho-hannover.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Behavior, Animal / physiology* Choice Behavior Cricetinae Darkness Female Light Litter Size Male Motivation / physiology* Phodopus / physiology*, psychology Photoperiod Physical Conditioning, Animal / physiology* Pregnancy Reproduction / physiology* |
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