The welfare of broiler chickens and other poultry at slaughter depends critically on the effectiveness of stunning and the skill of slaughter operatives.
Slaughter is the final welfare event for every farmed bird, and the quality of that event — whether it involves unnecessary suffering — is determined by system design, operator training, and regulatory oversight. Water bath stunning systems create welfare problems at multiple points: birds are shackled while conscious, may receive painful pre-stun shocks, and can regain consciousness before death if stunning is inadequate. Controlled atmosphere systems that render birds unconscious before shackling address many of these concerns but require capital investment and are not universally adopted. The scale of poultry slaughter means that even small proportions of inadequately stunned birds translate into enormous numbers of individuals experiencing unnecessary suffering. CCTV monitoring and independent audit are important tools for maintaining and improving standards.