Table 1 Lameness score adopted in our study (AAEP score)

Score 0

= sound in all circumstances (walk, trot and fast work at the racetrack)

Score 1

= lameness difficult to detect and not consistently obvious, regardless of circumstances^a

Score 2

= lameness undetectable at walk and difficult to detect at trot in straight line, but consistently apparent under certain circumstances of fast work^a

Score 3

= lameness consistently detectable at trot in straight line and under all circumstances

Score 4

= obvious lameness at walk

Score 5

= minimal weight bearing