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Table 4 Effect of essential oils on ileal bacterial populations of broilers on day 21

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 9.00 7.89 8.00 2.27
 60 mg/kg EO, unchallenged 9.28 7.98 7.60 2.35
 120 mg/kg EO, unchallenged 9.35 8.30 7.55 2.34
 240 mg/kg EO, unchallenged 9.22 8.14 7.15 2.34
 Basal diet, challenged 9.41 8.11 8.72 2.50
 60 mg/kg EO, challenged 9.48 8.38 8.99 2.39
 120 mg/kg EO, challenged 9.44 8.39 8.26 2.43
 240 mg/kg EO, challenged 9.29 8.27 8.03 2.57
 SEM 0.068 0.073 0.137 0.033
P-value
 Challenge 0.185 0.169 <0.001 0.030
 EO 0.735 0.438 0.095 0.805
 Challenge × EO 0.828 0.888 0.713 0.655
 Linear b 0.945 0.366 0.027 0.553
 Quadratic b 0.261 0.172 0.853 0.707
  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