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Biology of Reproduction, Vol 24, 778-783, Copyright © 1981 by Society for the Study of Reproduction
1 Department of Bio behavioral Sciences,
University of Storrs, Connecticut 06268
and
National Institute of Child Health and Human Development,
National Institutes of Health, Bethesda, Maryland 20205 Daily changes in pineal melatonin content were examined in four rodent species (rat, Syrian
hamster, Turkish hamster, and Siberian hamster). All species had elevated pineal melatonin levels
during the dark period of a lighting cycle with a long photoperiod of 16 h of light per day, and no
obvious differences were observed between photoperiodic and nonphotoperiodic species. Pineal
melatonin levels of Siberian hamsters maintained in either a short (10 h of light per day) or a long
photoperiod were elevated for most of the dark period, so the duration of elevated levels of pineal
melatonin was longer in a short photoperiod than in a long photoperiod. Treatment of pinealectomized Syrian hamsters with melatonin during the time of the night when pineal melatonin
content would be elevated induced gonadal regression, while pinealectomized rats failed to respond
to exogenous melatonin.
Accepted on January 2, 1981
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