The scientific recognition of animal sentience represents one of the most significant moral progress stories of the 20th and 21st centuries, with profound implications for how we treat farm animals.
The moral status of farm animals has undergone a remarkable transformation over the past century. Animals that were legally treated as mere property with no capacity for suffering are now recognized in law and science as sentient beings with welfare interests that constrain how they may be treated. This moral progress — driven by scientific evidence, philosophical argument, and public advocacy — is incomplete but undeniable. Battery cages have been banned across the EU. Gestation crates are being phased out globally. Fish welfare is entering regulatory frameworks for the first time. Each generation of welfare legislation goes further than the last. The moral arc of history, applied to animals, bends toward recognition of their capacity for suffering and the consequent obligation to reduce it.