Table 1.

Locomotion scoring system used.

Score	Category	Description
0	Normal	Even weight bearing and rhythm on all four feet. The back is level.
1	Imperfect locomotion	Uneven steps or shortened strides, but affected limb not identifiable. The back may show minimal arching while walking.
2	Impaired locomotion	Uneven weight bearing or shortened strides. Affected limb is identifiable (unless multiple limbs affected). The back may show arching while walking.
3	Severely impaired locomotion	Slower pace—Unable to keep up with the healthy herd. Affected limb easily identifiable (unless multiple limbs affected), but whole foot placed to floor. An arched back may be noted while standing and walking.
4	Severely impaired locomotion with non-weight bearing limb(s)	Slower pace—Unable to keep up with the healthy herd. Affected limb easily identifiable (unless multiple limbs affected). An arched back may be noted while standing and walking. One or more limb non-weight bearing or toe touching.

It was based on two systems, one used by Sprecher et al. and one promoted by the Agriculture and the Horticulture Development Board (22, 23).