Pig CO2 Slaughter Alternatives: Welfare Progress

High-concentration CO2 stunning for pigs is known to cause significant suffering before unconsciousness. Alternatives are being developed with direct welfare implications.

Key Facts

Over 90% of pigs in Europe are stunned using high-concentration (80-90%) CO2 before slaughter
CO2 at these concentrations causes aversion and pain before unconsciousness - pigs show distress responses for 30-60 seconds
The Humane Slaughter Association and others have been researching alternatives including lower CO2 concentrations mixed with inert gases
Argon and nitrogen inert gas stunning systems can achieve rapid unconsciousness with lower aversion than CO2
Some systems combine lower CO2 with argon to provide both rapid unconsciousness and humane characteristics
The EU Farm Animal Welfare Platform has identified CO2 stunning as a priority for slaughter welfare reform
Denmark and Sweden have piloted alternative stunning systems in some slaughterhouses with promising welfare outcomes

Welfare Considerations

CO2 pig slaughter represents one of the most clearly documented welfare failures in current food production. The science is unambiguous: high-concentration CO2 causes pigs to experience aversion, breathlessness, and pain before losing consciousness. This is known, and the welfare cost is large given the 150+ million pigs slaughtered annually in the EU. The persistence of CO2 stunning despite this evidence reflects the infrastructure cost of switching to alternative systems. However, the welfare gain from alternatives is substantial and justifies public pressure for industry transition.

What You Can Do

Support campaigns specifically targeting CO2 pig slaughter reform as a priority welfare improvement
Ask pork retailers about their suppliers' slaughter methods and timeline for transitioning away from high-concentration CO2
Support the Humane Slaughter Association's research into alternative slaughter systems
Advocate for EU and UK slaughter regulations to set phase-out timelines for high-concentration CO2 stunning