Fig. 1

Development of lameness as a marker of behavioural pain. A scoring system was used to assess lameness as a marker of behavioural pain. a Comparison of median lameness score in juvenile (n = 6 animals), 80 wk. adult (n = 6 animals) and older adult (n = 7 animals) pigs. * = p < 0.05, significantly different from juvenile lameness score as determined by Kruskal-Wallis non-parametric test with Dunn’s post-hoc test. b Median lameness score in adult pigs across an 16 week timespan from age 64 to 80 wk. old (n = 6 animals). ** = p < 0.01, significant change in median score over time as determined by Kruskal-Wallis test