Association of claw disorders with claw horn colour in norwegian red cattle - a cross-sectional study of 2607 cows from 112 herds

Table 2 Odds ratio (95% CI) for the significant (P < 0.05) associations between claw horn colour (light, mixed or dark) and the following claw disorders haemorrhages of the sole (HS), haemorrhages of the white line (HWL) and corkscrewed claws (CORK) in 2607 hind claws, adjusted for stall type (tie or free), parity and month in milk (MIM)⁴ and the random effects of herd and claw trimmer

Variable	Class	n	HS¹	HWL²	CORK³
Colour	Light	1163	2.61 (2.23/3.05)	2.34 (1.96/2.79)	1.54 (0.92/2.56)
	Mixed	153	1.43 (1.11/1.85)	1.46 (1.00/2.12)	1.84 (1.15/2.95)
	Dark	1291	1.00	1.00	1.00
Stall	Tie	1091	0.51 (0.39/0.68)	0.49 (0.36/0.67)	0.51 (0.29/0.89)
	Free	1516	1.00	1.00	1.00
Parity	1	1021	1.43 (1.16/1.78)		0.63 (0.48/0.82)
	2	708	1.02 (0.82/1.27)		1.06 (0.68/1.67)
	≥ 3	878	1.00		1.00
Random effects
Herd			1.80 (1.27/2.57)	2.03 (1.49/2.78)	1.73 (1.15/2.62)
Claw-trimmer			1.48 (1.08/2.02)	1.32 (1.01/1.74)	1.00 (0.89/1.12)

¹Numbers of cows with light-, mixed- and dark-coloured claws and HS were 268, 26 and 136, respectively
² Numbers of cows with light-, mixed- and dark-coloured claws and HWL were 176, 15 and 93, respectively
³ Numbers of cows with light-, mixed- and dark-coloured claws and CORK were 59, 10 and 43, respectively.
⁴Estimates (SE) for MIM and MIM*MIM were 0.48 (0.10) and -0.05 (0.01) for HS, 0.26 (0.05) and -0.03 (0.01) for HWL and 0.05 (0.02) for CORK (only MIM).

ISSN: 1751-0147