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 4 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					0.191	0.025
Triplet code^a	Reactive	14	1441	3284
	Proactive	22	3233	7258	-0.004	0.025	0.87
	Survey	21	2270	5682	0.026	0.029	0.37
Restock	No	48	6106	14284
	Yes	10	846	1970	-0.090	0.030	< 0.01
Farm location	Area A	12	720	1865
	Area B	40	5365	12320	-0.034	0.030	0.26
	Area C	6	868	2069	-0.025	0.045	0.59
Replacement cattle	Homebred	54	4611	9188
	Purchased	59	2341	4416	0.123	0.018	< 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 0.002, (s.e. 0.001)
Cattle variance 0.196 (s.e. 0.004)
Visit variance 0.075, (s.e. 0.001)

ISSN: 1746-6148