| Summary: | A total of thirty pigs were experimentally slaughtered using gas (80% CO<sub>2</sub> in air, 90 s; 30% CO<sub>2</sub>/70% N<sub>2</sub>O; 90 s) or electrical stunning (1.3 A, 10 s). Stunning may accelerate post-mortem muscle metabolism, due to psychological stress and/or muscle contractions. The specific effects of the stunning method were studied by limiting pre-stunning physical activity and stress: pigs were driven in a trolley from the rearing to the stunning site (6.5 m) and immediately slaughtered. Bleeding efficiency and carcass characteristics were similar and satisfactory for all stunning methods. Early post-mortem pH decline in the <i>Longissimus lumborum</i> was faster following gas compared to electrical stunning. The pH of other muscles was not influenced; color and drip loss showed minor effects. Hence, results are in contrast to current beliefs: compared to electrical stunning, following gas stunning, the stress and muscle contractions during the induction of unconsciousness have a slightly greater impact on <i>Longissimus lumborum</i> muscle metabolism; differences are minor and limited to certain muscles only.
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