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Tri iodo thyronine and thyroxine in the physiology of the migratory red headed bunting emberiza bruniceps


, : Tri iodo thyronine and thyroxine in the physiology of the migratory red headed bunting emberiza bruniceps. Indian Journal of Experimental Biology 21(4): 177-179

In the thyroidectomized captive redheaded bunting (E. bruniceps) during late May to late June, thyroxine (T4) was more potent than triiodothyronine (T3) in increasing whole body and liver respiration, erythrocyte number, Hb concentration, and hematocrit and the 2 hormones were equipotent on gonadal volume and body weight. T4 had no significant effect, but T3 decreased significantly the rate of respiration of the skeletal muscle. High T3 level, during winter, probably helps the bird to time increase in gonadal growth and migration. High plasma T4, during April-May-June, on the other hand, stimulates gonadal growth, erythropoiesis and oxidative metabolism to provide energy for migration and reproduction.

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Related references

Chandola A.; Pathak V., 1980: Pre migratory increase in circulating tri iodo thyronine to thyroxine ratio in the red headed bunting emberiza bruniceps. The circulating triiodothyronine/thyroxine (T3/T4) ratio in the red-headed bunting significantly increased prior to migration. Marked extrathyroidal conversion of T4 to T3 also occurred. The possibility that migratory disposition in this bird may...

Pathak V.K.; Chandola A., 1982: Seasonal variations in extrathyroidal conversion of thyroxine to tri iodo thyronine and migratory disposition in redheaded bunting emberiza bruniceps. Thyroid gland is involved in the migratory disposition in redheaded bunting, E. brunicpes. Extrathyroidal conversion of thyroxine (T4) to triiodothyronine (T3) was studied in thyroidectomized buntings by measuring the appearance of plasma T3 4 h a...

Thapliyal, JP.; Lal, P.; Singh, VK.; Pati, AK.; Gupta, BBP., 1983: Triiodothyronine & thyroxine in the physiology of the migratory redhead bunting, Emberiza bruniceps. In the thyroidectomized captive redheaded bunting (E. bruniceps) during late May to late June, thyroxine (T4) was more potent than triiodothyronine (T3) in increasing whole body and liver respiration, erythrocyte number, Hb concentration, and hema...

Sarkar, A.; Arora, M., 2002: Photoperiodic responses in male migratory red headed bunting, Emberiza bruniceps. The effect of four asymmetrical skeleton photoperiods on histology of testes were studied in migratory red headed bunting, Emberiza bruniceps. It was found that birds kept in CT12 (7L/5D/1L/11D) and CT14 (7L/7D/1L/9D) photoperiod programme showed...

Banerjee, S.; Chaturvedi, C.Mohini., 2015: Migratory preparation associated alterations in pectoralis muscle biochemistry and proteome in Palearctic-Indian emberizid migratory finch, red-headed bunting, Emberiza bruniceps. Avian migration is an exceptionally high-energy-demanding process, which is met by the accumulation and utilization of fuel stores as well as the alterations in muscle physiology prior to their flight. Pre-migratory fattening coupled with changes...

Tewary P.D.; Prasad B.N.; Kumar V., 1981: An evidence for the circadian control of pre migratory events in red headed bunting emberiza bruniceps. Photosensitive male red-headed buntings, E. bruniceps, were placed under 6 different lighting regimes of 20 to 30 h durations in which a 3 h photophase was coupled with the varying duratins of scotophases. A positive response was obtained only in...

Thapliyal, J.P.; Pati, A.K.; Singh, V.K.; Lal, P., 1982: Thyroid, gonad, and photoperiod in the hemopoiesis of the migratory red-headed bunting, Emberiza bruniceps. General and Comparative Endocrinology 46(3): 327-332

Sawjalow, E.W.; Tabatschischin, W.G., 2006: Distributional dynamics of the red-headed bunting Emberiza bruniceps in the north of the Lower Vogla area Verbreitungsdynamik der Braunkopfammer Emberiza bruniceps im Norden des Niederwolgagebietes. Ornithologische Mitteilungen, 583: 101-103

Chandola, A.; Pathak, V., 1980: Premigratory increase in circulating triiodothyronine/thyroxine ratio in the red-headed bunting (Emberiza bruniceps). The circulating triiodothyronine/thyroxine (T3/T4) ratio in the red-headed bunting significantly increased prior to migration. Marked extrathyroidal conversion of T4 to T3 also occurred. The possibility that migratory disposition in this bird may...

Chattopadhyay, S.; Ghosh, A., 1982: Hyperphagia, fattening and testicular response to exogenous testosterone propionate in migratory red headed bunting, Emberiza bruniceps. Proceedings of the Indian National Science Academy Part B Biological Sciences, 484: 513-517