Rooting Behaviour in Pigs and Wild Boar: A Fundamental Need

Rooting is perhaps the most fundamental behavioural need in pigs and wild boar. Denying this behaviour in intensive systems causes chronic frustration and welfare harm.

Key Facts

Pigs spend 2-6 hours per day rooting in natural and outdoor settings
Rooting serves multiple functions: foraging, thermoregulation, exploration, and play
Without rooting substrate, pigs direct the behaviour toward pen-mates — a major cause of injuries
Providing deep straw or peat eliminates most rooting-related aggression and injury
Wild boar have snout musculature adapted for powerful rooting — domestic pigs retain this anatomy

Welfare Considerations

Rooting is not merely a preference but a biologically motivated drive that pigs express compulsively when substrate is available and redirect disruptively when it is not. Pigs without rooting material develop chronic frustration evident in stereotypic rooting behaviours on floors and walls, and redirected rooting on pen-mates that causes injuries. The intensity of rooting motivation has been demonstrated in preference tests where pigs work hard to access rooting substrate even when well-fed. Providing straw or other rooting material is one of the simplest and most impactful welfare improvements available to pig producers.

What You Can Do

Choose pork products from outdoor or straw-based systems that allow rooting
Support retailer commitments to source pork from systems with manipulable materials
Donate to Compassion in World Farming campaigns for rooting substrate requirements
Advocate for mandatory provision of deep rooting substrate in pig welfare legislation
Engage with pig producers and advisors about the evidence for rooting substrate as a core welfare requirement