Developing reliable measures of positive emotional states in farm animals is a frontier of welfare science that promises to transform how we assess and improve welfare.
The scientific measurement of positive emotional states in farm animals is advancing rapidly, driven by recognition that welfare requires positive experiences rather than merely the absence of negative ones. Tools including qualitative behavior assessment, which evaluates the expressive quality of animal behavior, and cognitive bias testing, which infers emotional state from decision-making patterns, provide ways to assess positive affect that are increasingly practical for farm use. Farms that score well on positive affect measures typically have enriched environments, positive human-animal relationships, and management systems that allow natural behavior. These farms also tend to have better production outcomes, reinforcing the welfare-productivity alignment.