The method used to stun poultry before slaughter significantly affects welfare - comparing water bath, controlled atmosphere and mechanical stunning helps identify the most humane approaches.
Poultry stunning welfare involves choosing between imperfect options. Water bath stunning can be effective but requires precise voltage, frequency and immersion time - deviations cause pain. High-CO2 controlled atmosphere is aversive as birds show distress responses to CO2 before losing consciousness. Low-oxygen controlled atmosphere is considered the most humane current option but requires significant capital investment. Pre-slaughter handling including shackling conscious birds is an additional welfare concern for water bath systems. Consumer pressure for humane slaughter methods creates market incentives for investment in better stunning systems. Welfare certification schemes that specify stunning method requirements drive producer adoption.