Poultry Stunning Before Slaughter: Welfare Science and Industry Practice

Pre-slaughter stunning of poultry is the primary welfare intervention at slaughter, and its effectiveness varies significantly by method and implementation.

Key Facts

Approximately 70 billion chickens are slaughtered globally per year — more than any other farmed animal
Water bath electrical stunning is the most common method but causes distress during live shackling beforehand
Effective stunning must render the bird immediately unconscious and insensible to pain
Controlled atmosphere stunning (CAS) using high CO2 or nitrogen gas causes less pre-stun distress but higher capital cost
Religious slaughter without prior stunning is permitted in many jurisdictions, raising welfare concerns
Studies show that 4-5% of chickens in water-bath systems experience painful electric shocks without full stunning

Welfare Considerations

Poultry slaughter welfare is a massive-scale issue given the billions of birds processed annually. Live shackling of conscious birds in water-bath systems causes distress and fear before stunning even begins. Electrical failures or suboptimal stun parameters lead to birds entering scalding tanks alive and conscious — one of the worst welfare outcomes in the food system. Controlled atmosphere systems that stun birds in their transport crates eliminate shackling distress and improve stunning reliability, but are more expensive and less widely adopted. Welfare-conscious poultry slaughter is achievable at scale and should be required as minimum standard in all regulatory systems.

What You Can Do

Choose poultry products from farms using controlled atmosphere stunning or equivalent high-welfare slaughter methods
Support legislation requiring effective pre-slaughter stunning for all commercial poultry slaughter
Advocate for mandatory stunning in all religious slaughter to be negotiated with faith communities
Reduce poultry consumption or shift to plant-based proteins as the most direct welfare intervention