Body conformation traits in early-lactation associated with clinical mastitis and lameness in lactating Chinese holstein cows

Table 4 Effect of age (years) and the total score (points) of body conformation traits on the risk of clinical mastitis and lameness in Chinese holstein cows

Diseases	Effect	Level	B	SE	Wald χ²	df	OR value	95% confidence interval		P value
Diseases	Effect	Level	B	SE	Wald χ²	df	OR value	Lower limit	Upper limit	P value
Mastitis	Age	3 vs. 2	1.13	0.26	18.51	1	3.56	2.05	6.17	< 0.001
		4 vs. 2	1.38	0.27	25.85	1	4.34	2.47	7.64	< 0.001
		5 vs. 2	2.03	0.81	6.36	1	8.00	1.61	39.80	0.012
	TS	80–85 vs. 76–79	-0.71	0.17	17.69	1	0.49	0.35	0.68	< 0.001
lameness	Age	4 vs. 3	0.19	0.52	0.13	1	1.26	0.44	3.62	0.665
lameness	TS	80–85 vs. 76–79	-0.62	1.05	0.34	1	0.86	0.31	2.39	0.766

B: unstandardized regression weight; SE: standard error for B; Wald χ²: the test statistic for the individual predictor variable; df: degrees of freedom. For mastitis, the 2 years was the base class, while 76–79 TS (points) of the body conformation traits points for age. For lameness, the 3 years and 76–79 points were the base classes of the age and TS of the body conformation traits

ISSN: 1746-6148