The method of slaughter is one of the most significant welfare events in a farmed animal life, with stunning effectiveness directly determining whether animals lose consciousness before death.
Stunning effectiveness is highly variable in practice. Incorrectly applied captive bolts may fail to render cattle unconscious, requiring repeat stunning or causing partial loss of consciousness followed by recovery. Water bath poultry stunners rely on electrical parameters that vary significantly between slaughterhouses. Religious slaughter without pre-stunning causes a period of consciousness during which the animal experiences pain from the neck cut. These are welfare failures that occur at scale, affecting millions of animals annually, and they are addressable through better training, equipment maintenance, and monitoring requirements.