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Biology of Reproduction, Vol 10, 19-23, Copyright © 1974 by Society for the Study of Reproduction

Gonadal Responses of Hamsters to Interrupted Dark Periods

ROGER A. HOFFMAN 1, and HELEN MELVIN 1

1 Colgate University, Department of Biology, Hamilton, New York 13346


Subjecting hamsters to long daily periods of darkness leads to reproductive collapse. However, if long periods of darkness are broken into shorter periods by as little as a 15-min light pulse, normal reproductive function is maintained. Thus, the duration of the dark period determines reproductive activity rather than the amount of light/day or the light/dark ratio. It is suggested that there is either a critical amount of pineal antigonadal factor (PAG) released during the long dark period or it is inhibiting gonadotropin release beyond a certain critical time.

Accepted on May 23, 1973






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Copyright © 1974 by the Society for the Study of Reproduction.