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Table 2 Proportion of quarter foremilk samples from two herds (A, B) and for two pre-milking teat disinfection treatments (PTD: that received pre-milking teat disinfectant and NPTD: did not receive disinfectant) with a somatic cell count (SCC), < 100 × 103, 101–200 × 103, 201–300 × 103, 301–400 × 103, and > 401 × 103 cells/mL, across 5 sample dates

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

   PTD NPTD
Sample day SCC × 103 cells/mL A B A B
1   n = 185 n = 325 n = 179 n = 328
0–100 0.89 0.83 0.87 0.81
101–200 0.03 0.06 0.07 0.07
201–300 0.02 0.02 0.01 0.02
301–400 0.01 0.02 0.01 0.03
401+ 0.05 0.07 0.04 0.06
2   n = 160 n = 330 n = 157 n = 329
0–100 0.90 0.90 0.91 0.90
101–200 0.04 0.04 0.03 0.05
201–300 0.01 0.03 0.01 0.01
301–400 0.01 0.01 0.01 0.00
401+ 0.04 0.02 0.04 0.03
3   n = 192 n = 334 n = 193 n = 334
0–100 0.85 0.92 0.88 0.91
101–200 0.03 0.02 0.03 0.03
201–300 0.02 0.01 0.03 0.01
301–400 0.02 0.01 0.01 0.01
401+ 0.07 0.04 0.06 0.04
4   n = 187 n = 331 n = 186 n = 327
0–100 0.81 0.89 0.77 0.90
101–200 0.08 0.05 0.08 0.05
201–300 0.03 0.01 0.08 0.02
301–400 0.01 0.00 0.01 0.01
401+ 0.07 0.05 0.06 0.03
5   n = 193 n = 308 n = 190 n = 307
0–100 0.46 0.79 0.48 0.84
101–200 0.21 0.10 0.24 0.07
201–300 0.09 0.02 0.05 0.02
301–400 0.07 0.02 0.04 0.02
401+ 0.17 0.07 0.19 0.05
  1. Differences in quarter foremilk sample numbers within herds and between sample days are due to non-collected or unread quarter foremilk samples