Almeida O F
J Endocrinol. 1982 Feb;92(2):261-5. doi: 10.1677/joe.0.0920261.
Adult male Japanese quail held under short daily photoperiods (8 h light: 16 h darkness; 8L: 16D) had significantly higher plasma concentrations of thyroid-stimulating hormone (TSH), tri-iodothyronine (T3) and thyroxine (T4) than did those kept under long days (16L:8D). When given a single s.c. injection of 50 microgram thyrotrophin releasing hormone (TRH) the birds held under both the 8L: 16D and 16L: 8D photoperiods showed rapid increases in their blood concentrations of TSH, T4 and T3, the amplitude of the TSH response of the birds exposed to 16L: 8D being particularly marked. These results suggest that, in the male quail, long daily photoperiods produce a hypothyroid state as a result of diminished TRH secretion. The synthetic and secretory capacities of the thyroid gland and pituitary thyrotrophs are apparently unimpaired by long days.
在短日照（8小时光照：16小时黑暗；8L:16D）条件下饲养的成年雄性日本鹌鹑，其血浆促甲状腺激素（TSH）、三碘甲状腺原氨酸（T3）和甲状腺素（T4）浓度显著高于长日照（16L:8D）条件下饲养的鹌鹑。当给两组鹌鹑单次皮下注射50微克促甲状腺激素释放激素（TRH）后，处于8L:16D和16L:8D光周期的鹌鹑血液中TSH、T4和T3浓度均迅速升高，其中处于16L:8D光周期的鹌鹑TSH反应幅度尤为明显。这些结果表明，在雄性鹌鹑中，长日照由于TRH分泌减少导致甲状腺功能减退状态。甲状腺和垂体促甲状腺细胞的合成及分泌能力显然不受长日照影响。
