Document Detail

Endocrine correlates of hibernation-independent gonadal recrudescence and the limited late-winter breeding season in woodchucks, Marmota monax.
MedLine Citation:
PMID:  1974795     Owner:  NLM     Status:  MEDLINE    
Woodchucks (Marmota monax) normally experience gonadal recrudescence towards the end of a 4-5 month hibernation, emerge in late winter, immediately breed in a short 3-week breeding season, and have regressed gonads before the next hibernation. Our studies of wild and captive animals show that fertile females give birth to single litters after a 32-day gestation and their breeding season is terminated by a reactivation of the corpora lutea of pregnancy for 1-3 months immediately postpartum. In nonbred females the breeding season is likewise terminated by spontaneous luteinization of the ovaries for 1-3 months shortly after the vernal equinox. Tests regress and testosterone declines during and after the breeding season. Circannual reproductive cycles persist in the absence of hibernation and are shortened to 9-10 months after 3-5 years of a 12L:12D photoperiod. Unique aspects of this species that merit endocrine investigation include descent/retraction of testes, transient luteolysis at parturition, superactivation of postpartum corpora lutea, regulation of the pituitary-gonadal axis by an annual endogenous metabolic cycle entrained to the annual change in photoperiod, and the hormonal basis of hibernation.
P W Concannon; B Baldwin; P Roberts; B Tennant
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry / the Wistar Institute of Anatomy and Biology     Volume:  4     ISSN:  1059-8324     ISO Abbreviation:  J Exp Zool Suppl     Publication Date:  1990  
Date Detail:
Created Date:  1990-09-24     Completed Date:  1990-09-24     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9005420     Medline TA:  J Exp Zool Suppl     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  203-6     Citation Subset:  IM    
Department of Physiology, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York 14853.
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MeSH Terms
Animal Husbandry
Endocrine Glands / physiology*
Gonads / physiology*
Hibernation / physiology*
Marmota / physiology*
Reproduction / physiology*
Sciuridae / physiology*
Grant Support

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

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