Pineal Gland: Influence on Gonads of Male Hamsters

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Science  18 Jun 1965:
Vol. 148, Issue 3677, pp. 1609-1611
DOI: 10.1126/science.148.3677.1609


Exposure of male hamsters to cycles of 1 hour of light and 23 hours of darkness causes atrophy of the gonads. Pinealectomy prevents this atrophy, but has no effect on animals exposed to light-dark cycles of 16 : 8. Likewise, removal of both eyes induces gonad atrophy which is prevented by pinealectomy. These data emphasize the importance of the pineal gland in the regulation of photoperiodic influences on the gonads.