Nose ringing of pigs is practiced to prevent rooting in outdoor systems, but causes acute pain and restricts fundamental natural behaviour, raising significant welfare concerns.
Nose ringing fundamentally conflicts with one of the pig's most highly motivated natural behaviours — rooting. By creating pain when pigs attempt to root, the procedure causes chronic frustration and welfare compromise even in otherwise good outdoor environments. Evidence shows that rung pigs show signs of ongoing discomfort and reduced rooting behaviour compared to intact pigs. Alternative approaches including rotational grazing, hardstanding areas, and appropriate stocking density can manage pasture effectively without this welfare compromise.