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Probiotics can promote the health and growth performance of animals through modulation of intestinal microbiota. When used as a feed additive, they have the potential to minimize or abolish the use of antibiotics. In this study, we investigated the effect of the probiotic strain  Bacillus amyloliquefaciens  TL on the growth performance and cecum microflora composition in Cobb 500 broiler chickens. In total, 180 broilers were randomly divided into three groups—each group comprised 4 pens, and each pen contained 15 chickens. The three groups were fed either a control diet, or a diet supplemented with either the antibiotic chlortetracycline or  B. amyloliquefaciens  TL. Broilers were weighed, and cecum contents were collected on days 7, 14, 21, and 35, respectively. The broilers in both the antibiotic and probiotic groups exhibited significant weight gain compared with controls, exhibiting increases of 16.02% and 13.40%, respectively, after 35 days ( P  < 0.01). Similarly, the feed conversion ratio (FCR, 1–35 days) of broilers in the chlortetracycline and  B. amyloliquefaciens  TL groups was lower than that of the controls. HiSeq high-throughput sequencing of 16S rRNA of the cecal microbiota was performed on days 7, 14, 21, and 35, respectively. The  Firmicutes / Bacteroidetes  ratio was higher in the chlortetracycline and  B. amyloliquefaciens  TL groups than in the control group on days 14, 21, and 35, and especially on day 21. The prevalence of genera  Oscillospira ,  Ruminococcus ,  Butyricicoccus , and  Faecalibacterium  ( Firmicutes ) was higher in the antibiotic and probiotic groups, while that of  Bacteroides ,  Parabacteroides  ( Bacteroidetes ), and  Lactobacillus  was higher in the control group. In this study, the changes in the microbiota of the probiotic group were similar to those in the antibiotic group. These results suggest that the probiotic strain  B. amyloliquefaciens  TL can modulate the cecal microbiota of broilers similar to chlortetracycline.

Preliminary Study on the Effect ofBacillus amyloliquefaciensTL on Cecal Bacterial Community Structure of Broiler Chickens