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Document Type

Research

Abstract

Female sparrows (Passer domesticus) were subjected to increased daily periods of illumination at different times during the fall and winter. In every instance the effect upon the ovary was very slight. On the other hand, the ovaries respond to injections of gonadotropic hormones at any time during the sex cycle. The development approaches that attained at the height of the breeding season. The results indicate that it is not a refractoriness of the ovary which explains the non-effect of light during the fall and winter, but rather the failure of the anterior pituitary to release the essential hormones. Contrary to the situation in the male sparrow, the pituitary of the female responds little to light stimulation.

Publication Date

1937

Journal Title

Proceedings of the Iowa Academy of Science

Volume

44

Issue

1

First Page

208

Last Page

208

Copyright

© Copyright 1937 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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