Farmed Pig Slaughter Welfare and Stunning

Pig slaughter welfare depends critically on the stunning method and its correct application. Failures at this stage cause conscious animals to enter the slaughter process — one of the most serious welfare failures in animal agriculture.

Key Facts

Approximately 1.4 billion pigs are slaughtered annually worldwide
Electrical stunning requires correct placement and current — failures result in conscious animals being killed
Carbon dioxide (CO2) stunning is widely used in large facilities but causes significant distress during induction
Pigs show aversive responses to CO2 at concentrations used for stunning — squealing, escape attempts, and gasping
Argon and nitrogen gas mixtures cause unconsciousness with less apparent distress than CO2
CCTV monitoring in slaughterhouses has been shown to reduce welfare incidents in facilities that use it

Welfare Considerations

Pig slaughter welfare failures at the stunning stage are among the most serious in food animal production. CO2 stunning — used in the majority of large commercial facilities — causes a distressing 30-60 second induction period during which pigs show strong aversive behavior and apparent pain. Argon or nitrogen-based systems reduce this suffering significantly but require capital investment. Electrical stunning, when properly applied, is more rapid but requires skill and equipment maintenance. The scale of pig slaughter — over a billion animals annually — means that even marginal improvements in stunning methods would have enormous aggregate welfare impact.

What You Can Do

Support campaigns advocating for inert gas replacements for CO2 in pig slaughter
Advocate for mandatory CCTV monitoring in all pig slaughter facilities
Choose pork from facilities that disclose slaughter method and have verified higher welfare standards
Reduce pork consumption or shift to plant-based alternatives while slaughter welfare standards improve
Support research into rapid, low-distress stunning methods for pigs