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The objective in this study was to identify risk factors for flock …


Biology Articles » Agriculture » Animal Production » A farm-level study of risk factors associated with the colonization of broiler flocks with Campylobacter spp. in Iceland, 2001 – 2004 » Table 4

Table 4
- A farm-level study of risk factors associated with the colonization of broiler flocks with Campylobacter spp. in Iceland, 2001 – 2004

Six logistic models for farm-level factors associated with Campylobacter in broilers in Iceland (n = 28a)

Variable
Automated forward selection
Automated forward stepwise
Automated backward selection
Automated backward stepwise
Manual backward selection using "manure spread in summer"
Manual backward selection using "manure spread in winter"

Median flock size on farm (divided by 1,000)
0.10 (0.000)b
0.10 (0.000)
0.11 (0.000)
0.09 (0.001)
0.13 (0.000)
0.12 (0.000)
Farm water source
           
     Non-official
    Ref.
Ref.
Ref.
Ref.
     Non-official treated
    -0.57 (0.066)
-0.03 (0.913)
-0.50 (0.169)
-0.33 (0.370)
     Official
    -0.60 (0.051)
-0.76 (0.009)
-1.04 (0.004)
-0.99 (0.005)
     Official treated
    -0.87 (0.032)
-1.06 (0.006)
-1.21 (0.006)
-1.17 (0.007)
Other domestic livestock on farm
    -0.65 (0.026)
-0.60 (0.028)
-1.01 (0.004)
-0.90 (0.004)
Other commercial poultry on farm
0.59 (0.000)
0.59 (0.000)
    -0.72 (0.063)
-0.59 (0.097)
Number of houses on farm
    0.06 (0.038)
  0.13 (0.008)
0.11 (0.008)
Manure spread on fields in winter seasonc
    0.54 (0.035)
1.90 (0.014)
Not included in model
0.97 (0.004)
Manure spread on fields in summer seasonc
      -1.71 (0.028)
0.92 (0.025)
Not included in model
Manure stored on farm at any time of year
        -0.83 (0.029)
-0.76 (0.025)
Farm has all-in-all-out policy
           
AICd of model
5.09
5.09
4.86
4.78
4.94
4.79

a Only farms with complete data for all variables are included

b Regression coefficient (p-value).

c Variables are highly correlated (τb ≥ 0.8)

d Akaike's Information Criterion


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