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Thyroidectomy prevents the development of photorefractoriness and the associated rise in plasma prolactin in starlings

Journal Article · · Gen. Comp. Endocrinol.; (United States)
;

Intact and radiothyroidectomized male starlings were transferred from short (8-hr) to long (16-hr) day lengths and measurements made of testicular development and of plasma prolactin concentrations. In intact birds the testes reached full maturity within 3 weeks and regressed after 6 weeks of photostimulation, indicative of the development of photorefractoriness . Prolactin levels increased gradually, reaching maximal values at the time of testicular regression. Testicular growth was normal in the thyroidectomized birds. Removal of the testes from thyroidectomized birds after 1 year on long days resulted in a marked rise in plasma FSH, indicating that these birds were indeed not photorefractory ; FSH levels in the refractory-intact starlings remained low after castration. These results confirm that the presence of an intact thyroid gland is essential for the development of photorefractoriness and for the release of prolactin which normally follows photostimulation.

Research Organization:
Univ. of Bristol, United Kingdom
OSTI ID:
6222895
Journal Information:
Gen. Comp. Endocrinol.; (United States), Journal Name: Gen. Comp. Endocrinol.; (United States) Vol. 54:2; ISSN GCENA
Country of Publication:
United States
Language:
English

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Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
551001 -- Physiological Systems-- Tracer Techniques
560152 -- Radiation Effects on Animals-- Animals
59 BASIC BIOLOGICAL SCIENCES
62 RADIOLOGY AND NUCLEAR MEDICINE
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL MATERIALS
BIOLOGICAL RADIATION EFFECTS
BIRDS
BLOOD
BLOOD PLASMA
BODY
BODY FLUIDS
CASTRATION
ENDOCRINE GLANDS
FSH
GLANDS
GONADOTROPINS
GONADS
HORMONES
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LTH
MALE GENITALS
MATERIALS
MEDICINE
ORGANS
PEPTIDE HORMONES
PHOTOSENSITIVITY
PITUITARY HORMONES
RADIATION EFFECTS
RADIOASSAY
RADIOIMMUNOASSAY
RADIOINDUCTION
SENSITIVITY
SURGERY
TESTES
THYROID
THYROIDECTOMY
TRACER TECHNIQUES
VERTEBRATES