Castration is routinely performed on male farm animals for management and product quality reasons. Welfare science on pain management during and after castration has driven significant policy changes.
Livestock castration without pain relief causes tens of millions of animals acute and sustained pain every year — a welfare cost that is entirely preventable with available medicines and techniques. The barrier is economic and cultural: analgesics cost money and require veterinary prescription in some jurisdictions, and there is a historical assumption in livestock farming that pain management in routine procedures is unnecessary or impractical. Welfare science has comprehensively refuted this assumption: pain from castration is real, significant, and measurable, and effective mitigation is available. Countries and assurance schemes that have made pain relief mandatory have demonstrated that compliance is achievable at modest cost. The case for extending mandatory pain management requirements globally is robust.