Rooting is the most strongly motivated natural behaviour in pigs, yet the vast majority of farmed pigs have no access to substrate that allows this fundamental drive to be expressed.
The rooting drive in pigs is not simply about finding food — it is a complex, sensory-rich behaviour involving exploration, soil manipulation, and tactile investigation that occupies the majority of wild pigs' active time. Depriving pigs of rooting opportunity does not make the drive disappear; it redirects it onto available surfaces including penmates. This redirection is the proximate cause of much of the ear- and tail-biting welfare harm that is then addressed through further mutilations like tail docking — a second-order welfare harm in response to a first-order one. Adequate rooting substrate provision is the most direct, evidence-based single intervention available to reduce these cascading welfare problems. The barriers to adoption are economic (straw costs, manure handling) rather than technical.