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Table 1 Number of ESBL/ AmpC Escherichia coli (EEC) challenge organisms (mean log10 cfu/g of 4 birds) in caecal contents of specific pathogen free White Leghorn chickens pre-treated with a competitive exclusion (CE) culture on day 1 of life or untreated controls exposed to seeder birds infected with EEC 1478 N (SHV-12) or EEC 1479 N (CMY-2) at 2 days of life (5 contact birds/ 1 seeder bird) (experiment 1)

From: Efficacy of a competitive exclusion culture against extended-spectrum β-lactamase-producing Escherichia coli strains in broilers using a seeder bird model

Day of life Group 1 Group 2 Group 3 Group 4
1 20 contact birds pre-treated with a CE culture 20 contact birds untreated 20 contact birds pre-treated with a CE culture 20 contact birds untreated
2 Addition of 4 seeder birds infected with EEC 1478 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1478 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1479 N (105 cfu/ bird) Addition of 4 seeder birds infected with EEC 1479 N (105 cfu/ bird)
  Caecal contents Caecal contents Caecal contents Caecal contents
9 6.2a 8.7 5.7b 8.8
16 5.7a 8.5 4.0b 8.6
23 3.2a 8.3 3.0b 8.6
30 3.0a 8.2 2.9b 8.6
37 2.2a 7.8 2.4b 8.5
  1. asignificantly lower than group 2; bsignificantly lower than group 4
  2. Standard error: 0.374