Scientific understanding of farm animal sentience has advanced considerably. Understanding the current consensus helps frame the ethical imperative for better welfare standards.
The scientific consensus on farm animal sentience is now sufficiently strong to place the burden of justification on those who claim these animals do not experience suffering in morally relevant ways. All major farm animal species have the neurological architecture associated with pain and emotional experience, demonstrate behaviours consistent with negative emotional states under poor welfare conditions, and show positive welfare indicators when conditions are good. This consensus does not eliminate all uncertainty about the subjective experience of non-human animals, but it provides sufficient grounds for treating the prevention of farm animal suffering as a genuine moral obligation. The gap between what science tells us about farm animal sentience and what current farming practices reflect is one of the most significant ethical inconsistencies in contemporary society.