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Table 6 Effect of essential oils on cecal 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 11.16 8.52 9.77 3.05
 60 mg/kg EO, unchallenged 11.50 8.86 9.53 2.38
 120 mg/kg EO, unchallenged 11.41 9.16 9.51 2.83
 240 mg/kg EO, unchallenged 11.42 8.69 9.41 2.41
 Basal diet, challenged 11.28 8.60 9.28 3.68
 60 mg/kg EO, challenged 11.43 9.02 9.42 3.63
 120 mg/kg EO, challenged 11.40 9.06 9.46 3.30
 240 mg/kg EO, challenged 11.37 8.70 9.34 3.39
 SEM 0.041 0.068 0.085 0.110
P-value
 Challenge 0.973 0.785 0.316 <0.001
 EO 0.190 0.022 0.952 0.327
 Challenge × EO 0.842 0.916 0.783 0.466
 Linear b 0.299 0.673 0.566 0.270
 Quadratic b 0.129 0.002 0.927 0.606
  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