Sex differences in the onset of seasonal reproductive quiescence in hamsters.

Sex differences in the onset of seasonal reproductive quiescence in hamsters. Research Abstract Details 

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Sex differences in the onset of seasonal reproductive quiescence in hamsters. Abstract Text:

Annaliese K Beery,Justin J Trumbull,Jyeming M Tsao,Ruth M Costantini,Irving Zucker,

Day length is the primary cue used by many mammals to restrict reproduction to favourable spring and summer months, but it is unknown for any mammal whether the seasonal loss of fertility begins at the same time and occurs at the same rate in females and males; nor it established whether the termination of mating behaviour in males and females coincides with the loss of fertility. We speculated that females, owing to their greater energetic investment in reproduction, are the limiting sex in terminating offspring production in short days (SDs). Oestrous cycles and production of young were monitored in Syrian hamsters (Mesocricetus auratus) transferred from long days (LDs) to SDs. Females were mated to LD males after three to eight weeks of SD treatment; in a parallel experiment, males housed in SDs were mated to LD females. After five and eight weeks in SDs, at least twice as many males as females were fertile. Both males and females continued to copulate for several weeks after becoming infertile. The onset of seasonal infertility occurs earlier in females than males and the decline in fertility precedes the seasonal loss of mating behaviour in both sexes.

Sex differences in the onset of seasonal reproductive quiescence in hamsters. Publishing Authors By Initials

AK Beery,JJ Trumbull,JM Tsao,RM Costantini,I Zucker,

For similar urogenital system: genitalia: genitalia, male: testis research abstracts see: urogenital system: genitalia: genitalia, male: testis research

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Sex differences in the onset of seasonal reproductive quiescence in hamsters. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Proceedings. Biological sciences / The Royal Socie

VOLUME: 274

Page Numbers: 281-6

Journal Abbreviation: Proc. Biol. Sci.

ISSN: 0962-8452

DAY: 22

MONTH: Jan

YEAR: 2007

Sex differences in the onset of seasonal reproductive quiescence in hamsters. Information

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LANGUAGE: eng

NlmUniqueID: 101245157

Sex differences in the onset of seasonal reproductive quiescence in hamsters. Keywords Mesh Terms:

KEYWORDS: Testis

MESH TERMS: anatomy & histology

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Grant and Affiliation Information for Sex differences in the onset of seasonal reproductive quiescence in hamsters.

AFFILIATION: Helen Wills Neuroscience Institute, University of California, 132 Barker Hall, MC 3190, Berkeley, CA 94720, USA. annaliese@berkeley.edu

Country: England

AGENCY: United States NICHD

GRANT: HD 043098

ACRONYM: HD

MEDLINETA: Proc Biol Sci

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