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Biology of Reproduction, Vol 12, 223-231, Copyright © 1975 by Society for the Study of Reproduction

Effects of Photoperiod on Cyclicity and Serum Gonadotropins in the Syrian Hamster

RICHARD F. SEEGAL 1, and BRUCE D. GOLDMAN 1

1 Department of Biobehavioral Sciences, U-154, University of Connecticut, Storrs, Connecticut 06268 U.S.A.


Adult female Syrian hamsters were exposed to 10 or 14 hours of illumination daily. Animals on 14 hours of light per day showed consistent 4-day ovulatory cycles, but exposure to 10 hours of illumination daily resulted in acyclicity after about 6 weeks. The acyclic state was accompanied by large diurnal fluctuations in serum gonadotropin concentrations. These fluctuations may be responsible for the inhibition of estrous cyclicity; alternatively, they may be correlated with, but not causal to, the inhibition of estrous cycles.

Accepted on August 23, 1974




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Copyright © 1975 by the Society for the Study of Reproduction.