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Journal of Biological Rhythms
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Circannual Variations in Plasma Luteinizing Hormone Levels in Castrated Male European Starlings (Sturnus vulgaris)

John Dittami

Max-Planck-Institut für Verhaltensphysiologie, Vogelwarte, D-8138 Andechs, Federal Republic of Germany

Eberhard Gwinner

Max-Planck-Institut für Verhaltensphysiologie, Vogelwarte, D-8138 Andechs, Federal Republic of Germany

Intact and castrated male European starlings were held for about 2 years in a constant 12-hr photoperiod and constant temperature conditions. At 1- to 2-month intervals, testicular width was measured by laparotomy, and blood samples were taken for analysis of plasma luteinizing hormone (LH). Most of the control birds went through at least one circannual cycle of testicular width and plasma LH concentration. In the castrates, a similar proportion of birds went through circannual LH cycles with periods indistinguishable from those of the controls. It is concluded that the testes and their hormones are not essential components of the mechanism that generates circannual gonadal cycles in male European starlings.

Journal of Biological Rhythms, Vol. 2, No. 3, 221-226 (1987)
DOI: 10.1177/074873048700200305
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A. Dawson
Plasma-Luteinizing Hormone and Prolactin during Circannual Rhythms of Gonadal Maturation and Molt in Male and Female European Starlings
J Biol Rhythms, August 1, 1997; 12(4): 371 - 377.
[Abstract] [PDF]

Home page
 J Biol RhythmsHome page
A. Dawson and F.J. McNaughton
Circannual Rhythms in Starlings: Response of Castrated Birds to 12-Hr Days Depends on Photoperiodic History
J Biol Rhythms, July 1, 1993; 8(2): 141 - 150.
[Abstract] [PDF]