A four year longitudinal sero-epidemiology study of Neospora caninumin adult cattle from 114 cattle herds in south west England: Associations with age, herd and dam-offspring pairs

Table 5 Multi-level model of fixed effects associated with N. caninum antibody level (S/P ratio) for the herds with a mean herd seroprevalence ≥ 10% (Dataset B).

Variable	Category	No. herds	No. cattle	No. obs.	Coef	SE^b	P value
Intercept					0.441	0.056
Triplet code^a	Reactive	24	1885	4689
	Proactive	12	1433	2990	1.105	0.127	< 0.01
	Survey	16	917	2423	0.035	0.121	0.77
Restock	No	40	3151	7673
	Yes	14	1090	2510	-0.110	0.072	0.13
Farm location	Area A	24	3651	4285
	Area B	25	3985	5263	-0.129	0.115	0.26
	Area C	5	255	635	-0.069	0.162	0.67
Age (years)	2	44	699	760
	3	51	1432	1618	0.054	0.031	0.08
	4	53	1583	1850	0.078	0.032	0.01
	5	50	1272	1450	0.143	0.034	< 0.01
	6	51	1120	1296	0.162	0.035	< 0.01
	7	46	793	1045	0.195	0.037	< 0.01
	8	39	383	773	0.178	0.040	< 0.01
	9	25	135	545	0.201	0.044	< 0.01
	≥ 10	8	16	846	0.160	0.045	< 0.01

^aPart of the Randomised Badger Culling Trial (RBCT) in the south west region with three treatments – reactive proactive or no culling of badgers (survey only)
^b Standard Error
Herd variance 0.004, (s.e. 0.010)
Cattle variance 0.625 (s.e. 0.015)
Visit variance 0.248, (s.e. 0.005)

ISSN: 1746-6148