In order to evaluate the effects of different levels of savory and thyme herbal medecines (0.05% of ethanloic extraction of savor, 0.05% ethanloic extraction of thyme, 0.025% of ethanloic extraction of savor and 0.025% of ethanloic extraction of thyme)on the population of intestinal bacteria and c-reactionproteins (CRP) of broilers in comparison with Flavomycinantibiotic growth promoter (0.045%), an experiment was conducted using 200 day-old Ross 308 chicks in completely randomized design manner having 5 treatments, 4 replicates and 10 chicks per replicate. Experimental treatmentsconsisted of 1) control (basal diet based on corn and soybean meal without any additives), 2) basal diet with 0.045% Flavomycin antibiotic growth promoter, 3) basal diet with 0.05% of ethanloic extraction of savor, 4) 0.05% of ethanloic extraction of thyme, 5) basal diet with 0.025% of ethanloic extraction of thyme and 0.025% of ethanloic extraction of savor. Results showed that the number of bacteria salmonella, E. coli and Coliforms were not affected by the different treatments. Also, SRBC injection showed no significant changes on the intestinal bacterial load. The CRP content was affected by dietary treatments. The maximum content of CRP was seen in control group. The combined savory and thyme extract showed the lowest CRP which significantly differed from control, 0.05% of ethanloic extraction of thyme and 0.05% of ethanloic extraction of savor groups. Injection of SRBC showed no impact on CRP.
