The scientific consensus on farm animal sentience — their capacity to have subjective experiences including pain, fear, and pleasure — has profound implications for policy and practice.
The evidence for farm animal sentience is no longer scientifically controversial — the debate has shifted from whether farm animals suffer to how much, in which circumstances, and what obligations this creates. A pig that shows fear when faced with the slaughterhouse race, a dairy cow who vocalizes when separated from her calf, a chicken who avoids areas where she has received electric shocks — these are not automated responses but reflections of subjective negative experiences. Policy and consumer behavior that ignores this evidence treats the welfare costs of animal agriculture as externalities that the animals, not the system, bear.