Rooting is one of the most fundamental pig behavioral drives. Providing appropriate rooting substrate addresses a core welfare need and dramatically reduces aggression.
Rooting substrate is the single most important enrichment element for pig welfare — more impactful than any other enrichment category because it addresses the most fundamental behavioral drive of the species. A pig denied rooting opportunity is experiencing ongoing behavioral frustration that drives the aggression, tail biting, and stereotypies common in bare concrete housing. The welfare benefit of providing straw, compost, or other suitable substrate is not incremental — it is transformative. Research consistently shows dramatic reductions in tail biting and aggression when pigs have adequate rooting material. The practical challenge in fully slatted floor systems is waste management: rooting substrate and slatted floors are incompatible. This incompatibility means that providing rooting substrate requires system-level change to solid or deep-litter floors — a welfare investment that producers and certification systems must be pushed to make.