gnatova et al. [12] conducted a research to evaluate effects of dietary inclusion of probiotics on chicken’s performance. Two hundred 1-d old male White Plymouth Rock-mini chickens were studied for this researchpurpose. However, results revealed that probiotic supplementation has positive effects on final body weight by 14.4% (P<0.001), increased feed intake by 7.7%, andimproved feed utilization by 8.1%. Several studieshave been conducted to evaluate the ability of probiotics to change the type and number of the microflora in thedigestive tract and results show that dietary supplementation of probiotic have a positive effect on growth performance and would significantly increase ADG and FCR in broiler chicks receiving probiotics [13,14,15]. The results of current study also show that feeding broilers with probiotics hadno significant effect on FI, but improved them as numeral and increasing FI itself could improve growth performance. CONC
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