| Thermogenic mechanisms during the development of endothermy in juvenile birds | ||
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Muscle tissue samples were collected from the musculus pectoralis, m. gastrocnemius and m. iliofibularis (III). Respiration in vitro in muscle tissue homogenate was determined polarographically at a temperature of 25°C using a Clark-type oxygen electrode (Bachofer). The respiration was estimated as the activity of cytochrome c oxidase (COX) in tissue homogenates.