Photoperiodic suppression of gonadotrophin secretion in castrated male hamsters

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Authors:
H. F. Urbanski
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and
S. M. Simpson
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DOI:
https://doi.org/10.1530/jrf.0.0660299
Volume/Issue:
Volume 66: Issue 1
Page Range:
299–303
Article Type:
Research Article
Online Publication Date:
Sep 1982
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Summary. Male golden hamsters were transferred from long to short days and castrated on the day of transfer (Group SPO) or 1, 2 or 3 weeks afterwards (Groups SP1, SP2 & SP3). Animals in Group LP were castrated and maintained on long days. After 7 weeks of short days, plasma levels of LH and FSH were low in Groups SP1, SP2, and SP3. In Group SPO LH output was also low and FSH secretion, although greater than in Groups SP1, SP2 and SP3, was lower than in the long-day controls (Group LP). This photoperiodic control of gonadotrophin secretion in castrated hamsters raises doubts about the significance of hypothetical alterations in hypothalamo—pituitary sensitivity to sex steroids.

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Print ISSN:
1470-1626
Online ISSN:
1741-7899