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Sow lameness is an issue in the swine industry that can result in decreased animal health and productivity. The objectives of this study were to evaluate pressure algometry (PA) and thermal sensitivity (TS) as objective pain assessment tools for sow lameness and to evaluate analgesic drugs for mitigating lameness pain. Twelve mixed parity crossbred sows were anesthetized and injected with Amphotericin B in the distal interdigital joint space of both claws of one hind leg to induce transient lameness. Sows were randomly assigned to one of three analgesic treatment groups: 1. Sodium Salicylate (SS; 35mg/kg per os q.12.h + 0.04 ml/kg IM q.24.h sterile saline), 2. Flunixin meglumine (FM; 2.2 mg/kg IM q.24.h), or 3. Control (C; 0.04 ml/kg IM q.24.h sterile saline). All sows received each treatment over three trials, with a two-wk wash-out period between trials. Fortyeight h post-induction, analgesic treatments were administered daily for four consecutive d. Pain was assessed with PA and TS relative to a foot-lift response on each hind leg on d-1, d+1 and d+6 relative to induction (d0). Differences between sound (S) and lame (L) legs by trial d, with a simple effect comparison to analyze effect of treatment on d+6 were analyzed with GLIMMIX in SAS. Sows did not differ in response to PA on d-1 (P>0.05), and tolerated less pressure on L versus S on d+1 (d+1 PA Raw Means in kilograms of force: L 2.11±0.17; S 7.70±0.17 kgf; P<0.01). No treatment alleviated pain as tested with PA on d+6 (Raw Means (kgf): FM-L 5.39±0.34 FM-S 7.71±0.30; SS-L 4.61±0.37 SS-S 7.79±0.31; C-L 5.25±0.40 C-S 7.40±0.29; P<0.05 for all treatments). The TS latency difference from S to L differed on each trial d (d-1 P=0.02, d+1 P<0.01, d+6 P<0.01) regardless of treatment on d+6. (TS Raw means (s): d-1 L 7.34±0.55; d-1 S 9.09±0.64; d+1 L 3.26±0.21; d+1 S 6.80±0.64; d+6 L 5.99±0.56; d+6 S 8.41±0.73). In conclusion, these results support PA as an

An investigation of pressure algometry and thermal sensitivity tests for assessing pain associated with a sow lameness model and calf disbudding