Abstract
We examined animal species differences in the postprandial thermic effect of meat and investigated the postprandial thermic effect of mutton in rats. After intake of experimental diets containing each meat, body temperatures of rats fed mutton or venison were significantly higher than that of rats fed rabbit meat. After intake of experimental diets containing fractionized mutton, the body temperatures of rats fed diets containing lean mutton protein were higher than those of rats fed diets without lean mutton protein. In a two-dimensional fluorescence difference gel electrophoresis study of brown adipose tissue, it was shown that the intake of mutton up-regulated the expression of many signaling molecules that are involved in energy metabolism. The postprandial thermic effect of mutton seems to be due not to catecholamine and adrenocorticotropic hormone but to thyroid hormones. The results suggest that intake of lean mutton protein stimulates the secretion of thyroid hormones and facilitates energy metabolism in rats.
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