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

Table 5 Effect of the mammary system traits on the risk of clinical mastitis in Chinese holstein cows

Trait	Level (points)	B	SE	Wald χ2	df	OR value	95% confidence interval		P value
Trait	Level (points)	B	SE	Wald χ2	df	OR value	Lower limit	Upper limit	P value
UD	6–9 vs. 2–5	-0.15	0.22	0.50	1	0.86	0.56	1.31	0.480
MS	6–8 vs. 2–5	-0.07	0.20	0.12	1	0.93	0.63	1.39	0.732
FUA	6–8 vs. 2–5	-0.49	0.19	6.79	1	0.61	0.43	0.89	0.009
FTP	6–8 vs. 3–5	-0.24	0.31	0.58	1	0.79	0.43	1.45	0.445
FUL	6–8 vs. 3–5	-0.40	0.31	1.68	1	0.67	0.37	1.22	0.195
RAH	6–9 vs. 3–5	0.751	0.31	6.05	1	2.12	1.17	3.86	0.014
RAW	5–8 vs. 1–4	-0.31	0.35	0.75	1	0.74	0.37	1.47	0.386
RTP	7–8 vs. 4–6	-0.92	0.29	10.43	1	0.40	0.23	0.70	0.001
ANG	6–8 vs. 3–5	-0.39	0.20	3.91	1	0.68	0.46	1.00	0.048

B: unstandardized regression weight; SE: standard error for B; Wald χ²: the test statistic for the individual predictor variable; df: degrees of freedom. According to the industry standard, the linear scoring median value of the trait was defined as the boundary, higher than the median value was defined as the group with high level of the trait, lower than the median value was defined as the group with low level of the trait, and the level of the low group was taken as the reference level of the trait effect

ISSN: 1746-6148