Circulating Levels of Thyroxine (T₄) and Triiodothyronine (T₃) in the Migratory Canada Goose

@article{John1978CirculatingLO,
  title={Circulating Levels of Thyroxine (T₄) and Triiodothyronine (T₃) in the Migratory Canada Goose},
  author={T. Mathew John and John C. George},
  journal={Physiological Zoology},
  year={1978},
  volume={51},
  pages={361 - 370}
}
Changes in circulating levels of thyroxine (T₄) and triiodothyronine (T₃) in the migratory Canada goose (Branta canadensis interior) during the different periods of its yearly life cycle in both its breeding and wintering grounds were investigated. Total plasma T₄ level ranged from a minimal value of 1.156 μg/dl in the fall postmigratory period to a maximal value of 1.737 μg/dl in the spring postmigratory period. The T₄ values during spring postmigratory period and breeding (1.700 μg/dl) were… Expand
Changes in plasma testosterone, thyroxine and triiodothyronine in relation to sperm production and remex moult in domestic ganders.
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Plasma T concentration was low at all stages of remex moult and regrowth and higher plasma T4 levels were found before and after this stage of the moult. Expand
Changes in Blood Levels of Thyroid Hormones in Two Species of Passerine Birds
Annual changes in plasma levels of thyroxine (T4) and triiodothyronine (T3) were compared in White-crowned Sparrows (Zonotrichia leucophrys gambelii) and House Sparrows (Passer domesticus) usingExpand
Plasma prolactin, thyroxine, triiodothyronine, testosterone, and luteinizing hormone during a photoinduced reproductive cycle in mallard drakes.
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Concentrations of plasma T4 and prolactin returned to baseline values after about 15 weeks photostimulation showing that the long-term maintenance of long-day refractoriness is not directly related to continuously high plasma concentrations of either hormone. Expand
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Observations do not suggest a major role for thyroid hormones in the initiation of photorefractoriness in the Willow Ptarmigan. Expand
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Seasonal changes in plasma levels of LH and GH in the Canada goose (Branta canadensis interior) have been studied and highest levels of GH were observed during molting and the immediately following fall premigratory period. Expand
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The results suggest that in natural molt of hens, the increased thyroidal activity is not necessarily a prerequisite for molt except that more T 3 is needed for thermoregulation due to the loss of feather insulation. Expand
Effects of exogenous arginine vasotocin on circulating levels of thyroid hormones and melatonin in the pigeon, Columbia livia.
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  • Biology, Medicine
  • Comparative biochemistry and physiology. Part C, Pharmacology, toxicology & endocrinology
  • 1995
TLDR
The absence of a significant increase in melatonin indicates that AVT could not produce such a change in the daytime in resting pigeons, in contrast to that in flown homing pigeon, suggesting that the modulating effect of AVT on melatonin levels is dependent on the physiological state of the animal. Expand
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References

SHOWING 1-10 OF 38 REFERENCES
Experimental studies on the annual cycles of thyroid and adrenocortical functions in relation to the reproductive cycle of drakes.
TLDR
Strong reciprocal negative interactions between testis and thyroid might afford a partial explanation of the peculiar thyroxine/testosterone imbalance that occurred in June immediately prior to the post-nuptial moult. Expand
ON THE INDUCTION OF MOLT IN BIRDS BY 17α-OXYPROGESTERONE-17-CAPRONATE
TLDR
The hormone seems to stimulate the resting papillae to become active in the birds of the first group and it can induce molt of the feathers of tail, wing and body in canaries, and in Bengalees molt begins about one week after injection regardless of the amount of the hormone. Expand
Seasonal Variation in Thyroxine Secretion Rates in Two Strains of New Hampshire Chickens
TLDR
A study of the thyroxine secretion rate of dairy cattle in Missouri has indicated considerable variation in rate due to seasonal change in environmental temperature, and two strains of New Hampshire chickens selected for high and low response to thiouracil are used. Expand
Reverse triiodothyronine in the chicken.
TLDR
RT 3 concentrations were low and often close to the detection limits of the assay in contrast to significant rT 3 levels found in mammals (man, monkey, sheep, rat and dog). Expand
Thyroid in avian reproduction
TLDR
It is suggested that changes in thyroid activity influence the output of the gonad-stimulating hormones from the adenohypophysis, which in turn regulate the annual and body weight cycles of Lal and Spotted Munia. Expand
The Value of Thyroprotein in Starting, Growing and Laying Rations I. Growth, Feathering and Feed Consumption of Rhode Island Red Broilers
TLDR
The work reported here is an attempt to provide further information on the value of thyroprotein when fed to broiler chicks under conditions approximating those in the field. Expand
The Annual Cycle of Thyroid Activity in White-Crowned Sparrows of Eastern Washington
TLDR
Evidence has been obtained which suggests that the thyroid cycle in Zonotrichia leucophrys gambelii is caused mainly by a cyclic environmental factor, very probably temperature. Expand
Estimation of Thyroid-Stimulating Hormone (TSH) Secretion Rates of New Hampshire Fowls.∗
  • C. E. Hendrich, C. W. Turner
  • Medicine
  • Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine
  • 1964
TLDR
TSR and TSH-SR of 2-year-old New Hampshire hens were shown to be significantly higher during late spring than during late summer to early fall and there was no significant correlation between TSR andTSH- SR of these hens. Expand
The Effects of High Environmental Temperature on Thyroid Secretion Rate of Domestic Fowl
TLDR
Since growth rate and egg production are retarded by high environmental temperatures, an experiment was designed to measure the thyroid secretion rate of fowl of different ages exposed to different environmental temperatures. Expand
The thyroid and the hypophysial gonadal axis in the female Spotted Munia
TLDR
It is suggested that the effects on the plumage are probably due to an indirect action of the thyroids by way of the body metabolism, but that those on the body weight and ovary are due to the direct influence on the hypothalamo/hypophysial/gonadal axis. Expand
...
1
2
3
4
...