Document Detail

Effect of transitional photoperiods on testicular development and puberty in male deer mice (Peromyscus maniculatus).
MedLine Citation:
PMID:  6512756     Owner:  NLM     Status:  MEDLINE    
In a series of five experiments, young male deer mice (Peromyscus maniculatus bairdii) were exposed to photoperiods ranging in length from 3 to 19 h per 24-h period, as well as to constant light and constant darkness. Reproductive organ growth as measured at 6 weeks of age was inhibited by less than or equal to 11.5 h of light. In males receiving 11.5-19 h of light, there was a quantitative increase in reproductive organ size as a function of photoperiod. Rather than a 'critical' photoperiod partitioning reproductive inhibition and stimulation, there was a zone of gradual transition from inhibition to full stimulation. Histological analysis of testes demonstrated that spermatogenesis was stimulated by long photoperiods. Examination of the epidermal surface of the penis by scanning electron microscopy indicated that penile spine development was also regulated by photoperiod.
J M Whitsett; P F Noden; J Cherry; A D Lawton
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of reproduction and fertility     Volume:  72     ISSN:  0022-4251     ISO Abbreviation:  J. Reprod. Fertil.     Publication Date:  1984 Nov 
Date Detail:
Created Date:  1985-02-04     Completed Date:  1985-02-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376367     Medline TA:  J Reprod Fertil     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  277-86     Citation Subset:  IM    
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MeSH Terms
Microscopy, Electron, Scanning
Organ Size
Penis / growth & development,  ultrastructure
Peromyscus / growth & development*
Seminiferous Tubules / growth & development,  ultrastructure
Sexual Maturation*
Testis / growth & development*

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

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