Subtle behavioral and physiological indicators of pain in pigs that enable earlier intervention and better welfare monitoring.
Pain recognition in pigs has historically lagged behind that in companion animals, with significant suffering going undetected because pigs often suppress overt pain responses in group settings where showing weakness has social costs. Research into pig pain indicators has accelerated considerably with the development of validated tools including grimace scales and behavioral ethograms that enable trained observers to detect pain earlier and more reliably. Implementing these assessment tools in commercial settings requires training stockpeople to recognize subtle indicators rather than waiting for obvious lameness or behavioral breakdown. Earlier pain detection enables earlier intervention with appropriate analgesia, reducing the duration and severity of pain experiences across the entire production population.