Nose ringing of outdoor pigs prevents rooting but causes pain and removes natural behaviour that is intrinsically important to pig welfare.
Nose ringing is a painful procedure that permanently impairs the most characteristic and welfare-significant behaviour of pigs — rooting. The nasal disc is richly innervated and highly sensitive, making ring insertion acutely painful and ring-related rooting discomfort chronic. Pigs attempt to root despite rings, causing repeated pain as the ring contacts hard soil or obstacles. Rooting is not merely a behavioural preference but a fundamental motivational need in pigs, and its permanent suppression through pain represents a significant chronic welfare compromise.