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Table 3 The adjusted effect of JD status on milk yield for each case-control comparison, after controlling for Days in Milk

From: Direct and indirect effects of Johne's disease on farm and animal productivity in an Irish dairy herd

Case-control comparison

Overall model fit (R2 value)

Milk yield difference (kg)a

P-value

Clinical comparisonb

0.526

-1259.29

0.001

Pre-clinical comparisonb

0.542

21.18

0.704

Test positive comparisonb

0.315

84.49

0.157

  1. Negative value indicates that average yield was lower in case compared to control lactations.
  2. b. Linear regression model used: Yield = JD status, Days in Milk