Pigs have an intense drive to root and explore with their snouts, and providing rooting material like straw dramatically improves welfare in farm settings.
Rooting is not optional for pigs — it is a behavior driven by a fundamental motivational system that cannot be suppressed without welfare consequences. Pigs deprived of rooting material redirect this motivation to pen mates, biting tails and ears in ways that cause serious injury. Providing straw or other manipulable materials satisfies this drive and reduces redirected aggression dramatically. The challenge for intensive farms is that straw clogs slatted floor systems, requiring alternative solutions. However, the welfare imperative is clear, and farm systems that accommodate rooting material deliver measurably better welfare outcomes than those that do not.