Abstract
1. 1. The percentage of passively contracted fibres was subjectively evaluated in unfixed and formalin fixed rigor skeletal muscles from four species. 2. 2. The incidence of passively contracted fibres was considerably less in turkey muscles compared to mouse, bovine and porcine muscles. 3. 3. Formalin fixation caused a significant increase in the percentage of passively contracted fibres. 4. 4. Increasing tension on the muscles during fixation caused a significant reduction in the incidence of passively contracted fibres, but post-mortem temperature had no significant effect.
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