Developing and validating pain assessment tools for different livestock species is essential for improving pain recognition and treatment in commercial farming settings.
Pain assessment in livestock has historically relied on stockperson experience and species-general behavioral indicators that are difficult to standardize and often result in undertreatment. The development of validated grimace scales provides objective, teachable tools that significantly improve pain detection accuracy. These tools show that animals experiencing pain exhibit consistent facial muscle changes - tightening of orbital muscles, changes in ear position and facial surface - that can be assessed systematically. Training stockpeople to use these tools increases pain recognition and treatment rates. The translation of laboratory-validated grimace scales into practical farm tools requires simplification and integration into routine stockperson observation protocols.