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Table 4 Final multivariable negative binomial regression model between management practices and high somatic cell counts (incidence rate ratios (IRR) and 95% confidence intervals (CI)) from 263 Swiss dairy farms with a tie-stall and >10 cows in 2010

From: Questionnaire-based study to assess the association between management practices and mastitis within tie-stall and free-stall dairy housing systems in Switzerland

Factor Category IRR (95% CI) P-value
Type of farming Organic 0.72 (0.57-0.90) 0.005
Conventional 1.0 -
Prophylactic measures taken when purchasing a dairy cow Never purchase 0.87 (0.78-0.98) 0.02
  Other† 1.0 -
Type of stall Open/cold 1.65 (1.19-2.28) 0.002
Closed/warm 1.0 -
Lying surface No mat 0.82 (0.65-1.03) 0.09
Comfort mat 0.74 (0.62-0.89) 0.002
Rubber mat 1.0 -
Water trough cleaning routine At longer intervals 1.17 (1.03-1.33) 0.01
Daily 1.0 -
Feed analysis carried out Never 1.18 (1.06-1.32) 0.003
Regularly/occasionally 1.0 -
  1. California Mastitis Test, milk samples taken for bacteriological culturing, somatic cell count data from breeding associations is checked, claw condition is checked.