Pain Scoring in Pigs: Tools for Farm-Level Welfare Assessment
Pigs experience pain from disease, injury, and routine procedures, yet pain assessment on commercial farms is inconsistent. Validated pain scoring tools enable farmers and vets to identify, treat, and prevent pig pain more effectively.
Key Facts
The Porcine Grimace Scale (PGS) is a validated pain assessment tool based on facial action coding — similar to grimace scales developed for other species.
Key facial indicators of pig pain include orbital tightening, cheek tightening, ear position changes, and nose wrinkling.
Lameness scoring systems (0-3 or 0-5 scales) provide a practical welfare assessment tool for identifying mobility-impaired pigs requiring treatment.
Body condition scoring identifies pigs losing weight due to undetected disease or competition for feed.
Tail and ear wound scoring quantifies the extent of injurious pecking behaviour — a welfare and management indicator.
Welfare Quality protocols for pigs provide comprehensive farm-level assessment frameworks used in EU audits and research.
Welfare Considerations
Pain scoring tools for pigs represent the translation of welfare science into practical farm management. A farmer able to recognise pain from facial expression and locomotion patterns can identify suffering animals earlier, treat them sooner, and achieve better outcomes. The Porcine Grimace Scale requires observation skills that can be taught to stockpeople in short training sessions — making it practically deployable on commercial farms. Regular welfare assessment using standardised scoring creates farm-level data that identifies chronic problems (persistently high lameness prevalence) and tracks response to management changes. Embedding pain assessment into routine stockmanship transforms welfare from a reactive to a proactive practice.
What You Can Do
Support training programmes teaching stockpeople to use validated pig pain scoring tools.
Advocate for welfare audit requirements that include pain scoring as a mandatory component.
Choose pork certified to schemes requiring farm-level welfare assessment and pain management protocols.
Donate to farm animal welfare science organisations developing and validating pain assessment tools.
Learn about the Porcine Grimace Scale — understanding how pigs express pain improves recognition and advocacy.