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The egg breed, White Leghorn (WL), the meat breed, White Cornish (WC), and the dual purpose breeds, New Hampshire (Nil) and White Rock (WR) were subjected to this study. The carcass was divided into three parts, namely the body stem, the forelimbs, and the hind legs part respectively. The deposit fat and viscera were taken off from these three parts. The results obtained were as follows; (1) Body weight and the total muscle weight exhibited the same tendency that these weights became heavier in the order, in female WL<WR<WC and in male WL<NH<WR<WC. These weights of male of each breed were heavier than those of its female. (2) The total muscle weight per kg of body weight was as follows: in female, WL-359±16.5 g, WR-396±5.4 g, WC-438±4.7 g, and in male, WL-418±5.5 g, WR 486+6.6 g, NH-494±4.2 g, WC-533±3.6 g. (3) In female the weight of hind legs part was lighter than that of forelimbs, while, in male, the weight of hindelegs part was equal to, or in NH-male, was heavier than that of forelimbs . This suggsts that, in female, the growth of the hind legs part is worse than that of the forelimbs. And it seems that the growth of Nil-male hind legs part is better than that of any other breeds. (4) Generally, each muscle weight of the female forelimbs part per total muscle weight was larger than that of the male. On the contrary, each muscle weight of the male hind legs and body stem parts was larger than that of the female.