Pig Slaughter Welfare: The Last Hours of a Pig's Life

Slaughter is the most acute welfare event in a pig's life. Understanding the welfare challenges of transport, lairage, and slaughter line procedures enables both advocacy and informed consumer choices.

Key Facts

Approximately 1.4 billion pigs are slaughtered globally each year, making slaughter welfare a massive-scale concern
Lairage (holding at slaughterhouse before slaughter) is a period of high welfare risk from mixing, novelty, and temperature stress
Electrical stunning renders pigs unconscious if applied correctly; incorrect parameters cause pain without rendering unconscious
Controlled atmosphere stunning with CO2 is effective but causes aversion responses during induction phase
The high-pitched squealing during CO2 stunning is auditory evidence of aversion that remains the primary welfare concern with this method
CCTV monitoring in UK slaughterhouses has been mandatory since 2018 and has identified welfare violations that led to prosecutions

Welfare Considerations

The slaughter process involves the compression of multiple welfare stressors — transport, novel environment, unfamiliar animals, handling, and stunning — into a short period. Inadequate stunning represents one of the most acute welfare failures: a pig regaining consciousness on the slaughter line after failed stunning experiences pain and terror without any ability to escape. The scale of commercial slaughter means that even low rates of stunning failure represent large absolute numbers of suffering animals. Slaughter welfare improvements — CCTV monitoring, stunning verification protocols, lairage management — save suffering on a scale that few other welfare interventions can match per pound invested.

What You Can Do

Support mandatory CCTV monitoring in all commercial slaughter plants and access to footage by independent welfare organizations
Advocate for stunning verification protocols that confirm unconsciousness before bleeding in all commercial slaughter operations
Choose certified pork from supply chains with documented slaughter welfare standards including monitoring and audit
Support organizations conducting slaughter plant welfare audits and advocacy for regulatory improvement
Reduce pork consumption overall — each reduction reduces the number of animals processed through slaughter systems annually