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Table 5 Mean teat hyperkeratosis score (HK) for each herd (A, B), and for two pre-milking teat disinfection treatments (PTD: that received pre-milking teat disinfectant and NPTD: did not receive disinfectant) and at three sampling points during lactation

From: Effect of pre-milking teat disinfection on new mastitis infection rates of dairy cows

  HK s.e. Significance p-value
Herd A 2.04   
Herd B 1.64 0.04 < 0.001
PTD 1.83   
NPTD 1.84 0.05 0.82
Day 1 (April) 1.73   
Day 2 (July) 1.81   
Day 3 (October) 1.98 0.03 < 0.001
  1. Not significant for treatment * time
  2. No of observations = 1602