Table 1.

Number of cows for each variable.

Variable	Farm 1	Farm 2	Farm 3	Farm 4	Overall
Cows	32	61	42	60	195
Sound	19	42	25	31	117
Moderately lame	9	18	14	20	61
Severely lame	4	1	3	9	17
Hock score 0
Left hock	0	15	0	31	46
Right hock	0	14	0	31	45
Hock score 1
Left hock	15	37	23	27	102
Right hock	17	38	25	28	108
Hock score 2
Left hock	16	6	18	2	42
Right hock	15	8	13	1	37
Hock score 3
Left hock	1	3	1	0	5
Right hock	0	1	4	0	5
Bilateral	32	41	42	27	142
Unilateral	0	11	0	4	15
Neither	0	9	0	29	38
Multiparous	0	39	30	53	122
Primiparous	32	22	12	7	73
Early lactation	4	36	6	16	62
Mid lactation	19	25	29	32	105
Late lactation	9	0	7	12	28

Sound = locomotion score 1, no gait abnormality; Moderately lame = locomotion score 2, visible gait abnormality; Severely lame = locomotion score 3, obvious gait abnormality, cow noticeably favored one or more limbs; Hock score 0 = no visible injury; Hock score 1 = hair loss but no swelling; Hock score 2 = swelling present (but less than 7.4 cm in diameter); Hock score 3 = major swelling present (greater than 7.4 cm in diameter); Bilateral = hock injuries on both right and left hocks; Unilateral = hock injury on either the right or left hock; Neither = cow without a hock injury; Early lactation = cows less than 90 days in milk; Mid lactation = cows between 91–249 days in milk; Late lactation = cows 250 days in milk and greater.