Abstract

In the adult ram, experiments with a flash of light during the dark phase (scotophase scan experiments) demonstrate that, for LH, T, FSH, prolactin and testis diameter, photoperiodic time is measured by a rhythm of photosensitivity. A flash of one hour duration gave maximal stimulation (photosensitive phase) for LH, T, FSH and testis when the flash occurred between 16–17 hours after dawn; for prolactin maximal stimulation occurred when the flash was given 9 to 10 hours after dusk.

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