This study aimed to verify the effect of corrective trimming and the type of lesion on lameness score (LS), nociceptive pain threshold and temperature close to the lesion of lame cows. Six Jersey and 28 Holstein cows were used. The day before trimming (day −1), cows were gait scored using a 1-to-5 numerical rating system where 1 = perfect gait and 5 = severely lame. Cows showing LS of 4 or 5 were selected. On d 0 (trimming), cows were restrained in a tilt chute and before they were hoof trimmed, they were evaluated for pain threshold, temperature close to the lesion and type of hoof lesion, which were classified as dermatitis (digital and interdigital) or ulcers (sole and wall ulcers). Temperature close to the lesion was measured with a thermograph. Pain threshold was measured utilizing an algometer, applying a pressure stimulus at the regions close to the lesion of both rear legs, and observing the foot-lift response. Cows with dermatitis were given an antibiotic and a bandage, those with ulcers received glueing shoes and none received analgesic. After trimming, on d 6, cows were evaluated for LS and on d 7, cows were evaluated for pain threshold and temperature close to the lesion. Data were submitted to variance analysis according to a completely randomized design, considering in the model the effect of trimming, type of lesion and their interaction. Twenty-six cows had dermatitis, 8 cows had sole and wall ulcers. There was no interaction between type of lesion and trimming (Table 1). Trimming decreased LS and increased pain threshold but did not affect temperature close to the lesion. Cows dermatitis showed lower pain threshold than those with ulcers. Type of lesion did not affect LS nor the temperature close to the affected region. Trimming improved cow’s welfare. Table 1. Effect of trimming and type of lesion on lesion pain and temperature

Trait	Corrective trimming (T)				Type of hoof lesion (L)
Before	After	P > F	Dermatitis	Ulcers	P > F
Pain threshold (kgf)	7.0a	9.3b	<0.01		6.8 a	9.5b	<0.01
Lameness score (1 – 5)	4.5a	2.9b	<0.01		3.5 a	3.9a	NS
Temperature of affected region (°C)	29.6a	29.8a	NS		29.7 a	29.8a	NS