Abstract

1. 1. Cytochrome oxidase, succinate oxidase and lactate dehydrogenase were compared in: (a) leg and breast muscle from 11–19-day-old chick embryos; and (b) 2, 6, 10 and 14-day-old primary cell cultures established from myoblasts of embryonic leg and breast muscle. 2. 2. Cytochrome oxidase, succinate oxidase and lactate dehydrogenase activities were higher (48.8, 65.4, 277.6%, respectively) in leg muscle after 19 days in ovo. 3. 3. Cytochrome and succinate oxidase activities were higher (111.3, 48.1%, respectively) in leg muscle cell cultures after 14 days in vitro. 4. 4. The data represent evidence for intrinsic developmental patterns for certain enzymes.

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