الفهرس 
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Abstract
The aim of this study was to assess the efficacy of bacillus subtilis and bacillus licheniformis alone and in a combination as probiotic dietary supplementation and lincomycin as feed additives on the performance parameters (body weight gain, food consumption, food conversion ratio, hot carcass weight and yield as well as mortality), the hematological profile and intestinal microflora in normal and Clostridium perfringens induced necrotic enteritis challenged broiler chickens. A total of 160 one‐day‐old broiler chicks (43.35±0.25 g) were randomly divided into two treatments, with four replicates per treatment, and twenty broilers per replicate. The two treatment groups were uninfected and infected. The uninfected group with three replicates and twenty broilers per replicate were fed on basal diet (control negative), basal diet + BAM-100® and basal diet + Lincomix®50 + BAM-100®. The infected group with five replicates and twenty broilers per replicate were fed on basal diet (control positive), basal diet + B-Act®, basal diet + Baymix® grobigTM BS, basal diet + Lincomix®50 and basal diet + BAM-100®. In uninfected group, performance parameters including weight gain (WG) and feed conversion ratio (FCR) were significantly improved by all probiotics and lincomycin compared to control negative group. WBCs, RBCs, PCV, Hb, MCV, MCH and LYM were showed a significant increase in uninfected broilers that fed on probiotic and lincomycin compared to control negative group. Infected broilers fed with all types of probiotics and lincomycin improving growth performance and hematological parameters compared to control positive group. Therefore, dietary supplementation of probiotic and lincomycin were beneficial in attenuating the negative effects of CP challenge on the performance and intestinal microflora of broilers chickens.
Key words: Probiotic – Lincomix®50 – BAM-100 – Clost.