Table 1

The explanatory variables in the repeated measures multi-level model (Tables 3 and 4).

Explanatory variable

Variable defined


Triplet Code

Treatment in the Random Badger Culling Trial (RBCT)

Restocked

Herd was depopulated due to the foot-and-mouth (FMD) epidemic in 2001

Geographical area (farm location)

Geographical area, which the farm was situated in, categorised as Area A-(Gloucestershire, Herefordshire/Worcestershire), Area B-(northeast Devon, south Somerset), Area C-(northwest Devon, northeast Cornwall)

Cattle age (years)

In yearly intervals from 2 years old up to 10 years and over

Herd size

Taken from the VetNet database the average number of cattle present in the herd during the study period

Birthplace of replacement cattle

Cattle were homebred (tested in natal herd) or purchased (tested in herd different from natal herd)

Dairy cattle

Yes or no dairy cattle were present in the herd

Grower cattle

Yes or no grower cattle were present in the herd

Season

Time when visit took place. Winter (December, January and February), Spring (March, April and May), Summer (June, July and August) and Autumn (September, October and November)


Woodbine et al. BMC Veterinary Research 2009 5:5   doi:10.1186/1746-6148-5-5

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