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American Zoologist 1975 15(4):917-922; doi:10.1093/icb/15.4.917
© 1975 by The Society for Integrative and Comparative Biology
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Seasonal Changes in Prolactin Physiology

MARTIN SAG and VICTOR L. DE VLAMING
Department of Biology, University of Missouri-St. Louis St. Louis, Missouri 63121
Department of Biology, Marquette University Milwaukee, Wisconsin 53233

Prolactin is involved in seasonal changes in physiology in several classes of vertebrates. However, prolactin is not involved in the timing of all such seasonal changes. In teleosts changes of day length resulted in changes in the diurnal rhythm of the lipogenic effects of prolactin. Thus, where prolactin physiology changes with season it may result from changes in the diurnal physiology of this hormone. There are at least two aspects to these cyclical changes since both hormone release and hormone effect may change. In teleosts the pineal may respond to changes in day length and modify prolactin release. Further work is required especially in the construction of models that will allow the ordering of the complex data.


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