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Table 1 Theoretical number of different contacts per year in 5 example herds

From: Risk assessment as a tool for improving external biosecurity at farm level

a. Examples included three cattle herds and two pig herds. Input values used in the baseline scenario
Contact Dairy herd 180 milking cows Suckler herd 65 cows Calf fattening herd 120 calves Farrow-to-finish herd 484 sows Specialised fattening herd 1600 pigs
Introduced live animalsa 10 2 108, in 18 batches 200, in 20 batches 5200, in 26 batches
Animal transport vehiclesb 25 3 20 60 52
Deadstock collections 17 2 3 25 5
AI technician 280 NAc NA NA NA
Veterinarian 20 2 4 12 6
Hoof trimmer 2 1 NA NA NA
b. Examples included three cattle herds and two pig herds. Input values used in the low-risk scenario
Introduced live animalsa 1 1 100, in 5 batches 100, in 10 batches 5200, in 13 batches
Animal transport vehiclesb 20 3 16 50 26
Deadstock collections 15 2 3 20 5
AI technician 0 NAc NA NA NA
Veterinarian 20 2 4 12 6
Hoof trimmer 2 1 NA NA NA
  1. a If number of batches not specified, animals could be introduced from any herd and no sourcing from a limited number of herds was assumed
  2. b Total number of transport vehicles, including those that collect animals from the farm
  3. c NA = Not applicable