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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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