期刊
JOURNAL OF THERMAL BIOLOGY
卷 31, 期 5, 页码 386-393出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2006.01.002
关键词
little bunting; Emberiza pusilla; thyroid hormone; basal metabolic rate; BMR; thermoregulation
Thyroid hormones can increase energy expenditure and stimulate basal thermogenesis by lowering metabolic efficiency. In the present study, we examined the effects of thyroid hormones on basal heat production as well as on several physiological and biochemical measures indicative of thermogenic capacity to test our hypothesis that thyroid hormones stimulate increases in thermogenesis in little buntings. Little buntings that fed on thyroxine (T-4)-laced poultry food of 3 and 5 ppm concentrations showed increases in basal metabolic rate (BMR) during the 3-week acclimation. At the end, these buntings had lower body weights, higher levels of contents of mitochondrial protein, state 4 respiration and cytochrorne c oxidase activity in liver and muscle, and higher concentrations of serum triiodothyronine (T-3) and T-4 compared to control buntings. These results support the argument that thyroid hormones play an important role in the regulation of thermogenic ability in buntings by stimulating mitochondrial respiration and enzyme activities associated with aerobic metabolism. (c) 2006 Elsevier Ltd. All rights reserved.
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