Association between antibodies to Coxiella burnetii in bulk tank milk and perinatal mortality of Danish dairy calves

Table 1 Within-herd Spearman's correlation coefficients for repeated sample-to-positive ratios of Coxiella burnetii bulk tank milk antibody recordings in 24 Danish dairy herds.

	N	Lag1	Lag2	Lag3	Lag4	Lag5	Lag6	Lag7	Lag8	Lag9	Lag10	Lag11	Lag12
S/P	290	0.87	0.85	0.82	0.78	0.79	0.80	0.78	0.75	0.74	0.73	0.74	0.78
Lag1	266	1	0.87	0.85	0.81	0.76	0.78	0.78	0.76	0.75	0.70	0.70	0.80
Lag2	242		1	0.87	0.84	0.79	0.75	0.77	0.75	0.75	0.71	0.68	0.87
Lag3	219			1	0.87	0.84	0.79	0.73	0.76	0.75	0.72	0.70	0.73
Lag4	196				1	0.86	0.83	0.77	0.72	0.75	0.72	0.70	0.78
Lag5	173					1	0.86	0.82	0.76	0.73	0.75	0.67	0.70
Lag6	150						1	0.86	0.81	0.75	0.70	0.75	0.72
Lag7	127							1	0.87	0.82	0.74	0.68	0.92
Lag8	104								1	0.86	0.79	0.76	0.86
Lag9	81									1	0.85	0.81	0.92
Lag10	58										1	0.87	0.78
Lag11	35											1	0.92

N is the number of samples included in the estimation. Lag1 expresses the previous recording; Lag2 is two recordings earlier etc.

ISSN: 1751-0147