Farm Animal Welfare

Farmed Pig CO2 Stunning Alternatives Research

Research into alternatives to CO2 stunning for pigs is accelerating in 2026, driven by welfare science evidence of CO2 aversion and distress.

Key Facts

Pigs are aversive to CO2 - they will work to avoid high concentrations
The aversion period of 15-30 seconds at induction is a significant welfare concern
Argon-based stunning causes rapid, non-aversive unconsciousness but requires higher gas costs
Low atmospheric pressure stunning (LAPS) is effective but requires significant capital investment
Electrical stunning of pigs is effective but requires individual animal handling

Welfare Considerations

CO2 stunning causes demonstrable distress during the induction phase. With welfare science evidence clear and alternatives available, the case for transitioning away from CO2 stunning is strong. Research, demonstration, and regulatory pressure are driving this transition.

What You Can Do

Advocate for CO2 stunning alternatives in pig welfare legislation
Support research into the welfare of alternative stunning methods
Engage with slaughter welfare organisations pushing for CO2 alternatives adoption