Feed additives are increasingly used in animal agriculture for production benefits, but some — including antimicrobials, growth promoters, and novel compounds — have significant welfare implications.
Livestock feed additives create a welfare landscape that ranges from clearly beneficial to clearly harmful. Coccidiostats that prevent parasitic intestinal disease are genuine welfare interventions, reducing suffering from a common and painful condition. Ractopamine sits at the opposite end: its association with elevated agitation, trembling, and cardiovascular stress — the reason for its ban in 160+ countries — represents a feed additive whose production benefits impose direct welfare costs on the animals consuming it. The growing interest in welfare-positive feed additives — compounds that improve gut health, reduce disease, or support immune function without antibiotic resistance concerns — represents one of the most promising areas of applied welfare nutrition research. Supporting regulation that bans welfare-compromising additives while enabling welfare-positive alternatives advances both goals simultaneously.