Rooting is one of pigs' most fundamental behavioral needs. Providing appropriate substrate and enrichment materials dramatically improves welfare in intensive pig production.
The rooting drive in pigs is an intrinsic, highly motivated behavior that cannot be suppressed without welfare cost. Pigs on slatted concrete floors without rooting material redirect this behavior onto pen-mates, causing tail biting, ear biting, and flank biting — major welfare problems in intensive systems. Providing straw as a rooting substrate allows expression of the full behavioral repertoire. Where straw is impractical due to slurry systems, alternatives such as compost blocks, peat, or deep-litter areas can partially satisfy rooting motivation. Research consistently shows that pigs with rooting access display more positive welfare indicators: play behavior, exploratory nosing, and lower aggression. Transitioning housing systems to incorporate rooting substrate is one of the most cost-effective welfare improvements available.