Table 1

Numbers and distributions of samples collected from farms

Sample source (n)No. of samples
Fecal (3/group)Boot swabs (1 pair/group)Dust (1/group)
Mixed farms (30)
    Cows903129b
    Calves89a3030
    Beef cattle89a3129b
    Sum2689288
Beef cattle farms (15)
    Youngest group451515
    Oldest group451614b
    Sum903129
Control group (10)
    Cow-calf herds (9)2793c
    Beef cattle farms (1)622
    Sum33115
  • a There were not enough animals for a third fecal sample.

  • b A dust sample was replaced with another pair of boot swabs.

  • c If not on pasture, a dust sample was collected as well.