Rooting is among the most fundamental behavioral needs of pigs, and its frustration in barren housing systems causes significant welfare harm.
Rooting is not a preference or a luxury for pigs - it is a fundamental behavioral need with deep evolutionary roots. Pigs housed in barren systems with no access to manipulable substrate have no outlet for this motivation, leading to high levels of frustration and redirected behaviors. Tail biting - which kills and severely injures thousands of pigs annually - is primarily a consequence of inadequate enrichment. The welfare case for rooting substrate provision is therefore not just about satisfying a preference but about preventing a cascade of serious welfare harms. The primary barrier to substrate provision is the design of slatted floor manure management systems, which are incompatible with large quantities of organic material. System redesign to accommodate enrichment is a long-term structural welfare investment.