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Temporal Synergism of Corticosterone and Prolactin Controlling Gonadal Growth in Sparrows
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Gonadal growth was controlled in two avian species by corticosterone and prolactin injected daily at various times. Testicular growth was induced in photorefractory house sparrows (
Passer domesticus
) kept in continuous light by prolactin injected 4 or 8 hours after administration of corticosterone. Other temporal patterns were ineffective. Gonadal growth was also stimulated in photosensitive white-throated sparrows (
Zonotrichia albicollis
) kept in continuous light by prolactin injected 12 hours after administration of corticosterone. Daily injections of prolactin 8 hours after injection of corticosterone inhibited gonadal growth. The seasonal cycle of reproductive photorefractoriness and photosensitivity is controlled by a changing relation between the daily rhythms of plasma concentrations of corticosterone and prolactin.
American Association for the Advancement of Science (AAAS)
Title: Temporal Synergism of Corticosterone and Prolactin Controlling Gonadal Growth in Sparrows
Description:
Gonadal growth was controlled in two avian species by corticosterone and prolactin injected daily at various times.
Testicular growth was induced in photorefractory house sparrows (
Passer domesticus
) kept in continuous light by prolactin injected 4 or 8 hours after administration of corticosterone.
Other temporal patterns were ineffective.
Gonadal growth was also stimulated in photosensitive white-throated sparrows (
Zonotrichia albicollis
) kept in continuous light by prolactin injected 12 hours after administration of corticosterone.
Daily injections of prolactin 8 hours after injection of corticosterone inhibited gonadal growth.
The seasonal cycle of reproductive photorefractoriness and photosensitivity is controlled by a changing relation between the daily rhythms of plasma concentrations of corticosterone and prolactin.
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