Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 26, 597-602, Copyright © 1982 by Society for the Study of Reproduction

ARTICLES

Photoperiodic inhibition of testicular development is mediated by the pineal gland in white-footed mice

PG Johnston, M Boshes and I Zucker

White-footed mice were maintained in short or long photoperiods from birth to 60 days of age (10 h vs. 14 h of light per day). Testes weights and spermatogenesis were substantially reduced in short daylengths. Pinealectomy at 5-7 days of age eliminated the suppressive effect of photoperiod on the reproductive system. However, testicular development was not retarded in intact males kept from 25 to 60 days of age in short daylengths. Exposure to short daylengths prior to 25 days of age contributes to photoperiodic inhibition of testicular development. Removal of the pineal gland did not consistently affect gonadal maturation in long photoperiods. The pineal gland transduces the effects of short daylengths on reproductive development. Some effects of long daylengths on the neuroendocrine axis of white-footed mice may also be mediated by the pineal gland.


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M. P. Butler, K. W. Turner, and I. Zucker
A Melatonin-Independent Seasonal Timer Induces Neuroendocrine Refractoriness to Short Day Lengths
J Biol Rhythms, June 1, 2008; 23(3): 242 - 251.
[Abstract] [PDF]


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Copyright © 1982 by the Society for the Study of Reproduction.