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Table 5 Effect of essential oils on ileal 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 9.13 7.70 6.09 3.00
 60 mg/kg EO, unchallenged 9.08 7.76 6.27 2.79
 120 mg/kg EO, unchallenged 8.85 7.71 5.90 2.94
 240 mg/kg EO, unchallenged 9.13 7.76 5.91 2.84
 Basal diet, challenged 9.26 7.99 6.13 2.96
 60 mg/kg EO, challenged 9.33 8.18 6.56 3.04
 120 mg/kg EO, challenged 9.08 7.98 5.76 2.95
 240 mg/kg EO, challenged 8.91 7.80 5.60 2.95
 SEM 0.058 0.081 0.098 0.051
P-value
 Challenge 0.421 0.135 0.887 0.462
 EO 0.365 0.877 0.092 0.953
 Challenge × EO 0.469 0.882 0.742 0.789
 Linear b 0.215 0.662 0.071 0.619
 Quadratic b 0.502 0.708 0.780 0.931
  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