Abstract
Summary
Chickens cold exposed to 2-3° had significantly elevated levels of plasma CPK compared with controls. After an initial increase during the first week, no significant difference was seen in plasma CPK activity of chickens cold acclimated at either 8-11 or 4-7° for 2-4 weeks when compared with controls. It is concluded that muscle activity (shivering thermogenesis) in cold-exposed chickens resulted in elevated plasma CPK, while the absence of muscle involvement (nonshivering thermogenesis) in cold-acclimated chickens resulted in no alterations in plasma CPK activity.
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