Reproductive Performance, Udder Health, and Antibiotic Resistance in Mastitis Bacteria isolated from Norwegian Red cows in Conventional and Organic Farming

Table 5 Factors associated with bacteriological positive milk samples.

		β	SE	OR	95% CI for OR	P
WIM		0.012	0.006	1.012	1.000, 1.024	0.07
MY		0.023	0.013	1.024	0.998, 1.050	0.04
Parity	1st parity¹	-	-	-	-	-
	2nd parity	0.023	0.196	1.023	0.697, 1.501	0.91
	> 2nd parity	0.534	0.203	1.707	1.146, 2.540	< 0.01
Intercept		- 1.435	0.355	-	-	< 0.01

¹ Categorical variable assigned as baselines
Associations between cows with milk samples positive for mastitis bacteria and explanatory variables; milk yield in the fourth week of lactation (MY), parity and weeks in milk (WIM) at s ampling date at the herd visit in conventional and organic farming (n = 845).

ISSN: 1751-0147