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- W2012156346 abstract "Summary. The effect of thyroid function on regulation of seasonal reproduction was investigated in three red deer stags thyroidectomized (THX) in summer (January 1988) in comparison with five thyroid-intact controls. Responses of luteinizing hormone (LH) and testosterone to a bolus injection of 10 μg gonadotrophin-releasing hormone (GnRH) were tested in July, October, December, February and April. Blood samples were collected at weekly intervals from December 1987 to June 1989 for measurement of testosterone, triiodothyronine (T3) and prolactin concentrations. Testis diameters were measured every 2 weeks. In October 1988 (spring), plasma LH concentrations of control stags were less responsive (P < 0·01) to stimulation by GnRH than those of THX stags; plasma testosterone concentrations and testis diameters were low and there was no increase in plasma testosterone concentrations after injection of GnRH in control stags during October or December (spring, early-summer). In contrast, THX stags maintained a testosterone response (P < 0·01) in these 2 months and did not exhibit any signs of a seasonal lack of reproductive activity at this time of year. Control stags cast antlers in spring whereas THX stags maintained hard antlers throughout the study. Concentrations of plasma T3 were not detected in THX stags from June 1988 onwards, but exhibited a seasonal pattern in control stags, with low concentrations during autumn and winter (April to July) and high concentrations in spring and summer (August to February). There was no effect of thyroidectomy on the seasonal pattern of prolactin secretion. These results show that thyroidectomy blocks the seasonal transition from the breeding to the nonbreeding season in red deer stags and support the hypothesis that thyroid hormones are required for this transition. Keywords: thyroidectomy; seasonality; iuteinizing hormone; testosterone; prolactin; red deer" @default.
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- W2012156346 date "1992-01-01" @default.
- W2012156346 modified "2023-10-16" @default.
- W2012156346 title "Requirement of thyroid function for the expression of seasonal reproductive and related changes in red deer (Cervus elaphus) stags" @default.
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- W2012156346 doi "https://doi.org/10.1530/jrf.0.0940251" @default.
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