Castration of male livestock is performed routinely across species. Welfare science on pain during and after castration has driven significant progress in analgesic use.
Livestock castration welfare is an area where the scientific evidence for suffering is robust and the tools for prevention are available, yet practice lags substantially behind knowledge. The acute pain of castration without analgesia is well-documented through behavioral, physiological, and neurological indicators. The persistence of no-pain-management castration in major livestock systems reflects cost concerns, regulatory gaps, and industry resistance rather than scientific uncertainty about whether the animals suffer. The welfare improvement achievable through universal adoption of simple analgesic protocols — local anesthetic injection and NSAID administration — is significant, achievable at low cost, and entirely within current veterinary and farming capacity.