Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 11, 125-132, Copyright © 1974 by Society for the Study of Reproduction

Photoperiod, Pineal HIOMT Activity and Reproductive Function in the Rat: A Proposed Model

JEROME M. YOCHIM 1, and EDWARD P. WALLEN 1

1 Department of Physiology and Cell Biology, University of Kansas, Lawrence, Kansas 66045


Measurements of pineal HIOMT activity in a 20-h diurnal photoperiod (L/D 1.4/1) confirm the concept of a mixed-wave hypothesis as a model for pineal function in the rat. Rats placed into the exotic photoperiod at times when the hypothetical component rhythms were calculated to be "in phase" exhibited a significant amplitude of pineal enzyme activity measured 12 days later. Conversely, amplitude was abolished in rats exposed to the 20-h environment such that the component rhythms were "out of phase." The results of these experiments were consistent with a previously reported relationship between the phases of the component rhythms and vaginal cyclicity. The present experiments, together with the findings of previous studies, provide a model which describes the role of the pineal gland in the hierarchy of neuroendocrine function related to reproduction.

Accepted on January 2, 1974






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