Pen design in pig housing significantly affects pigs' ability to express natural rooting behavior, a fundamental species-specific need. Evidence-based design improves welfare while maintaining practical farm management.
Pen design is an environmental welfare determinant for pigs that sets the parameters within which all other welfare interventions operate. A pen design that provides no substrate for rooting or foraging can be supplemented with enrichment materials, but cannot provide the continuous environmental complexity of bedded or outdoor systems. Welfare-centered pen design incorporates rooting and foraging opportunities as basic design features rather than optional additions, provides adequate space for the social complexity of the group, allows sick or bullied individuals to separate themselves from the group, and enables natural movement and postural diversity. Design investments made during building or renovation deliver welfare benefits across the lifetime of the facility.