It has long been suspected that light conditions play a role in the annual cycle of the sexual function in animals. Rowan (1925–1928), for example, observed North American finches who migrate every fall to their far distant winter quarters in the south. In captured birds, artificial daylight approximating the length of days in summer induced premature activity of the gonads, which had already regressed to their winter minimum. This exposure to light interrupted the natural migratory rhythm. Upon being set free, the finches broke off their migration and returned north even though it was still winter.


Sexual Function Golden Hamster Constant Light Constant Darkness Antler Growth 
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Copyright information

© Springer-Verlag New York Inc. 1979

Authors and Affiliations

  • Fritz Hollwich
    • 1
  1. 1.University of Muenster, West GermanyMünchen 40West Germany

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