Pig Pen Design and Welfare | Animal Welfare Hub

How the physical design of pig housing affects behavior, health, and welfare outcomes.

Key Facts

Pen design influences aggression, exploration, lying behavior, and social cohesion in pig groups
Solid floors with appropriate substrate support natural rooting behavior and reduce leg injuries
Dunging areas separate from lying areas allow pigs to maintain hygienic resting spaces
Pen complexity including barriers and objects reduces aggression by allowing escape and retreat
Slatted floors facilitate waste removal but restrict natural rooting and increase foot injury risk
Space allowance per pig is among the strongest predictors of welfare outcome in group-housed systems

Welfare Considerations

The physical environment pigs inhabit is one of the most powerful determinants of their welfare. A well-designed pen that provides adequate space, clean lying areas, rooting substrate, and sufficient complexity to allow retreat from social pressure creates conditions in which pigs can express natural behaviors and experience lower levels of chronic stress. Poorly designed pens concentrate pigs in confined, uniform spaces that generate aggression, injury, and behavioral frustration. Pen design improvements are among the most durable welfare interventions available in pig production.

What You Can Do

Support pig production systems with documented minimum space allowances per pig
Advocate for pen design standards that require rooting substrate, lying space separation, and complexity
Choose pork from producers that have moved away from fully slatted floors
Support research into pen design innovations that improve welfare without prohibitive cost increases
Engage with animal welfare policy to include pen design standards in national pig welfare legislation