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Table 2 Final multivariable negative binomial regression model between management practices and clinical mastitis (incidence rate ratios (IRR) and 95% confidence intervals (CI)) from 432 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
Farmers age >45 0.81 (0.71-0.93) 0.003
≤45 1.0 -
Production zone Mountain 0.73 (0.62-0.85) <0.001
Hill 0.91 (0.75-1.09) 0.32
Valley 1.0 -
Dairy herd replacement system Buying cows 1.27 (1.08-1.50) 0.004
Other† 1.0 -
Prophylactic measures taken when purchasing a dairy cow Never purchase 0.83 (0.71-0.98) 0.02
Other‡ 1.0 -
Milking system Bucket 1.21 (1.04-1.41) 0.01
Pipeline 1.0 -
Teat cleaning material Paper towel 1.19 (1.04-1.37) 0.01
Other§ 1.0 -
Feeding system Cow specific 0.81 (0.66-0.99) 0.04
Other 1.0 -
Intervention at each calving No 0.87 (0.75-0.99) 0.04
Yes 1.0 -
  1. Buying heifers, own rearing, contract rearing.
  2. California Mastitis Test, milk samples taken for bacteriological culturing, somatic cell count data from breeding associations is checked, claw condition is checked.
  3. §Wood wool, washable towel, wet towels with disinfectant, wet towels without disinfectant, no material.
  4. The same for all cows, different for lactating and dry cows, different for different production groups.