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Table 7 Effect of essential oils on cecal bacterial populations of broilers on day 28

From: In vitro antibacterial activity of thymol and carvacrol and their effects on broiler chickens challenged with Clostridium perfringens

Item a Total bacteria Lactobacillus Escherichia C. perfringens
Treatment
 Basal diet, unchallenged 11.18 9.14 8.83 2.68
 60 mg/kg EO, unchallenged 11.19 9.10 8.66 2.54
 120 mg/kg EO, unchallenged 11.31 9.16 8.80 2.55
 240 mg/kg EO, unchallenged 11.00 8.99 8.55 2.42
 Basal diet, challenged 11.18 9.22 9.24 2.79
 60 mg/kg EO, challenged 11.24 9.30 9.01 3.24
 120 mg/kg EO, challenged 10.89 9.19 8.77 2.78
 240 mg/kg EO, challenged 10.81 9.02 8.42 2.47
 SEM 0.046 0.056 0.092 0.077
P-value
 Challenge 0.126 0.473 0.428 0.078
 EO 0.076 0.624 0.269 0.205
 Challenge × EO 0.220 0.951 0.685 0.406
 Linear b 0.026 0.255 0.060 0.112
 Quadratic b 0.399 0.509 0.928 0.437
  1. a Values are means of eight replicates per treatment, and expressed as log10 (copy/g digesta). EO, essential oils; unchallenged, birds without challenge of C. perfringens; challenged, birds challenged with C. perfringens from day 14 to 20; SEM, pooled standard error of the mean; Challenge × EO, interaction between C. perfringens challenge and EO supplementation
  2. b When interaction between C. perfringens challenge and EO supplementation was not significant, linear and quadratic polynomial contrasts were performed on the main-effect means to EO dosages