Abstract
Antemortem material was obtained from Pietrain pigs during killing by anaesthetics and postmortem samples were obtained from the slaughterhouse. The light and electron microscopic antemortem structure of red and white skeletal muscle fibres is normal. Evidence of in vivo degeneration and subsequent regeneration is presented. After fixation, within 15 minutes of stunning, the myofibrillar and sarcoplasmic proteins in most of the fibres have coagulated. At present no connection between these phenomena has been established. It is clear that with this breed of pigs information about degenerative and regenerative processes in life cannot be obtained from a study of samples taken some time after death.
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