Table 1.

Variance in ERIC types of C. jejuni isolates originating from cows from pasture and housing farms^a

Source of variation	Variance factor				P value
	Degree(s) of freedom	Sum of squares	Variance components	% Variation
Between farms	1	22.6	0.03	7.3	0.002
Between cows
Within farms	33	153.3	0.15	33.5	<0.0001
Within cows	963	264.7	0.28	59.2	<0.0001
Total	997	440.6	0.46	100

^aData are AMOVA model results showing the hierarchical partitioning of the variance in ERIC types of C. jejuni isolates originating from 35 cows across the pasture farm and the housing farm over the sampling period.