Pig Cognitive Bias as Welfare Indicator

Cognitive bias testing reveals the emotional state of pigs beyond simple observation of physical health.

Key Facts

Cognitive bias tests measure whether animals in positive or negative states interpret ambiguous stimuli optimistically or pessimistically
Pigs trained to associate one location with reward and another with no reward show location bias correlated with welfare state
Pigs in positive welfare conditions show optimistic bias while those in poor conditions show pessimistic bias
The judgement bias task provides a non-invasive welfare assessment that captures subjective experience
Research from Cambridge and Newcastle universities has validated pig cognitive bias protocols

Welfare Considerations

Physical health metrics alone cannot capture the subjective emotional experience of pigs. Cognitive bias testing provides a window into pig emotional state, enabling welfare assessments that go beyond disease and injury to measure positive and negative affect. This research is transforming our understanding of what constitutes good pig welfare.

What You Can Do

Support pig welfare research programmes developing cognitive bias testing at farm scale
Advocate for inclusion of positive welfare indicators in farm assurance standards
Learn about pig sentience and emotional experience from Science of Animal Welfare resources
Choose pig welfare certification schemes that assess positive welfare states