Effect of supplementation with Bacillus subtilis Ba-B2013 on growth performance and intestinal microflora of chickens

Abstract

This study was conducted to evaluate the effect of Bacillus subtiliis Ba-B2013 on growth performance and intestinal microflora of chickens. The studied result showed that average daily weight gain (ADG) of chickens in the group supplementing Bacillus subtilis Ba-B2013 with 0.2% (20.32g/chicken/day) was significantly higher than ADG of chickens in the group supplementing the same probiotic with 0.1% (20.18g/ chicken/day ) (p <0.05). Feed conversion rate (FCR) of chickens in both experimental groups were lower than FCR of chickens in the control group, FCR of chickens in the experimental groups supplementing Bacillus subtilis Ba-B2013 at 0.1% and 0.2% were 3.43 and 3.41, respectively. This FCR of chickens in the control group was 3.63. The intestinal microflora density of chickens in the experimental groups significantly decreased in comparison with intestinal microflora density of chickens in the control group. The number of E.coli decreased from 5.59 log10CFU/g to 3.95 log10CFU/g, Salmonella spp. decreased from 2.21 log10CFU/gto 1.55 log10CFU/g, C. perfringens decreased from 2.28 log10CFU/g to 1.80 log10CFU/g.