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Table 1 Production data for 11 rotations affected by high mortality and 11 subsequent rotations not affected by high mortality.

From: Recurring outbreaks by the same Escherichia coli ST10 clone in a broiler unit during 18 months

  First week mortality (%) Total mortality (%) Weight first-week (g) Weight at slaughter (g) Age at slaughter (d) Condemnation at slaughter (%) No. of chicks per rotation
Affected rotations
 Mean 1.6 13.1a 173.5 2247 34.4 1.4 34 150
 Stdv 2.2 5.3 15.8 221 1.7 0.4 1870
 Range 0.6–7.8 6.1–21.7 150–210 1693–2523 31.1–37.6 0.7–1.8 32 500–39 000
Non-affected rotations
 Mean 0.6 2.7 170.8 2128 34.9 1.9 33 680
 Stdv 0.3 0.9 7.1 232 1.8 2.7 2448
 Range 0.4–1.2 1.5–4.5 160–180 1735–2474 32.2–37.3 0.4–9.4 29 000–37 000
  1. aThe total mortality rate was significantly higher (T test) in the E. coli outbreak-affected rotations (p  < 0.00009).