Photoperiodic Control of Reproduction in Male Hamsters: Role of FSH in Early Stages of Photostimulation

  • Fred W. Turek
  • Neena B. Schwartz
Part of the Serono Symposia USA book series (SERONOSYMP)


Reproductive activity for most birds and mammals inhabiting the temperate zones of the world is confined to a period of the year such that the birth of the young occurs when the probability of survival for both adults and offspring is maximum. While various environmental signals are used to synchronize the mating season to the appropriate season of the year (1), a primary factor that is the overriding one in many species for regulating various stages of the reproductive cycle is the annual change in day length (2, 3). For many species with a short gestation period (e.g., hamsters, voles, ferrets, and most temperate zone birds), reproductive activity takes place in association with the lengthening or long days of spring and summer; while for species with a long-duration gestation period (e.g., horses, sheep, and deer), mating activity occurs in association with the shortening or short days of fall and winter.


Circadian Clock Pineal Gland Photoperiodic Response Follicle Stimulate Hormone Level Photoperiodic Control 
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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Fred W. Turek
  • Neena B. Schwartz

There are no affiliations available

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