Seasonal Rhythm in the Thyroid Hormone Secretion of the Chick

Reineke, E. P.; Turner, C. W.

doi:10.3382/ps.0240499

Cited by 37 publications

(16 citation statements)

References 14 publications

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“…Second, the group of birds fed thiouracil showed average thyroid weights only slightly above the normal weight. While some seasonal decline was to be expected in the response to thiouracil feeding (Reineke and Turner, 1945) this decline was greater than should reasonably be expected. Further, the response to the graded doses of thyroxine was very irregular and unexpected.…”

Section: Experimental Methodsmentioning

confidence: 63%

Effect of Age and Season on the Thyroxine Secretion Rate of White Leghorn Hens

Turner

1948

Poultry Science

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Section: Experimental Methodsmentioning

confidence: 63%

Effect of Age and Season on the Thyroxine Secretion Rate of White Leghorn Hens

Turner

1948

Poultry Science

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“…Thus the cyclic changes in TBPA concentration may have some influence on the concentration of free thyroxine which can be maintained in plasma and along with TSH affect the state of activity of the thyroid gland. The histological appearance and size of the thyroid gland has long been linked with photoperiod; the weight of the thyroid in ducks is higher in June than in winter (Rosenberg, Astier, La Roche, Bayle, Tixier-Vidal & Assenmacher, 1967;Astier, Halberg & Assenmacher, 1970) and studies in the young chick (Reineke & Turner, 1945) and hen (Turner, 1948) indicate that the rate of secretion of thyroxine in summer is only half that in winter. The implication is that the enlarged thyroid contains an accumulation of thyroglobulin and thyroxine which is being synthesized more quickly than it is being removed.…”

Section: Discussionmentioning

confidence: 96%

Effect of Artificial Photoperiods on Plasma Thyroxine-Binding Prealbumin and Retinol-Binding Protein in Japanese Quail

Heaf¹,

Elsayed²,

Phythian³

et al. 1982

Journal of Endocrinology

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Variations in thyroxine-binding prealbumin (TBPA) and retinol-binding protein (RBP) concentrations in plasma were determined in Japanese quail subjected to a shortened solar lighting cycle lasting 4 months of real time. The concentration of TBPA varied inversely with the length of daily photoperiod up to 15 h (correlation coefficient r = \m=-\0\m=.\99) when a minimum level was reached of about 50% of that obtained under short days consisting of 8 h light : 16 h darkness (8L : 16D). A slight reversal in the concentration of TBPA occurred with photoperiods in excess of 16 h. The time-lag in response of the cyclic change in TBPA after the change in the lighting cycle was 8 days. The concentration of holoRBP, on the other hand, showed little change with photoperiods <15h, but between 15 and 17\m=.\5h it passed through peak values which were 24% and approximately 10% higher than the initial concentrations in female and male birds respectively. Total immunoreactive RBP concentrations in plasma peaked similarly in females but in males the apparent changes were not significant. The molar ratio of the two proteins (TBPA : RBP) which form a 1:1 complex in plasma also changed inversely with photoperiod from 1 \ m=. \ 6 on short (8L : 16D) to 0\ m=. \ 6 on long (16L : 8D) days. When the ratio declined below 1\m=.\0it was noted that rapid growth of the gonads took place and when this ratio returned to > 1\m=.\0 regression set in. The changes in plasma TBPA concentration were examined in Japanese quail subjected to sudden changes in photoperiod from short (8L : 16D) to long (20L : 4D) days and vice versa. In the group of birds transferred from short to long days the plasma level declined significantly (P<0\m=.\05) within 3 days, whereas birds changed from long to short days were more refractory in that a significant increase was seen only after 30 days. The synthesis of TBPA in liver is closely controlled by photoperiod and it seems that this protein plays an important role in the peripheral distribution of thyroxine and perhaps also influences the cyclical supply of retinol to the gonads.

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“…atmospheric temperature and daylight, on egg production. Whetham (1933), Bennion and Warren (1933), Reineke and Turner (1945) and Brody (1948), showed that temperature is one of the main causes of seasonal variation in the egg number laid by the fowl. On the other hand, Whetham (1933), Bartsch (1938), Alder (1943), Riley and Byerly (1943), all agreed that light whether natural or artificial had a stimulating effect upon egg yield in the domestic fowl.…”

Section: Introductionmentioning

confidence: 98%