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Respiration of Mitochondria Isolated from Dark-Cutting Beef: Postmortem Changes¹

University of California,² Davis 95616

Abstract

DARK-CUTTING beef can be produced experimentally by subcutaneous injection of epinephrine 24 hr. prior to slaughter (Hedrick et al.,1959). The sequence of events initiated presumably is the same as that resulting from overt forms of stress imposed upon the animal which effect the release of endogenous hormone. In the experimental animals, glycogen phosphorylase is activated (Ashmoreet al.,1971), and muscle glycogene is depleted, resulting in an abnormally high ultimate (48 hr.)pH of the meat (Hedrick et al.,1959).

¹ Supported in part by Public Health Service Grant FR-06138, HSAA and by Critical Research Fund, UCD.

² Laboratory of Muscle Biology, Department of Animal Science.

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