Pig castration causes significant pain in millions of piglets globally. Evidence-based pain management and genetic/production system alternatives are reducing this welfare burden.
Pig castration without pain relief represents one of the largest scale routine welfare harms in animal production globally. The procedure causes acute, intense pain — cortisol spikes, vocalizations, and behavioral pain indicators are clearly measurable and scientifically unambiguous. Despite this, the majority of male piglets globally are still castrated without anaesthesia or adequate analgesia, reflecting the gap between welfare science evidence and industry practice.
Post-operative pain is inadequately managed even in systems that provide some pain relief. Single-dose NSAIDs at castration provide limited coverage for the 2-3 days of post-operative discomfort. Multi-dose protocols and longer-acting formulations provide better welfare coverage but add management complexity and cost.
Immunocastration using Improvac (GnRH vaccine) eliminates surgical castration entirely. Two injections before slaughter suppress testicular function and prevent boar taint without physical surgery. Entire male production — raising pigs uncastrated — is practiced in some countries with genetic selection for low boar taint and management of social behavior. Both alternatives provide superior welfare outcomes to surgical castration and are commercially viable.