Farm Animal Welfare

Pig Slaughter CO2 Stunning Welfare

CO2 gas stunning of pigs at slaughter is the most widely used method but causes aversion and distress during induction, raising significant welfare concerns.

Key Facts

CO2 stunning is used in approximately 80% of UK pig slaughter operations
Pigs show distress including vocalisation and escape attempts during CO2 induction
The pain of CO2 acid sensation precedes loss of consciousness by 10-30 seconds
Alternative gas mixtures including argon and nitrogen cause less aversion
Captive bolt stunning avoids gas-related distress but requires skilled operators

Welfare Considerations

CO2 stunning causes a period of conscious distress from acid sensation before unconsciousness, affecting millions of pigs each year. Less aversive alternatives exist but require capital investment and operational changes, making their adoption a significant welfare priority for the industry.

What You Can Do

Advocate for research and adoption of less aversive stunning alternatives to CO2
Support certification schemes that incentivise use of low-aversion stunning methods
Engage with meat retailers about their commitments to improving slaughter welfare