Bacillus subtilis s train specificity affects performance improvement in broilers

Abstract

The study reports the effects on broiler performance of a newly isolated Bacillus subtilis strain, which is phylogenetically not closely related to already well-described strains of B. subtilis. In the first experiment, birds were reared in battery cages and exposed to C. perfringens. An increase in growth performance was observed with the strain when compared to the challenged animals. Three additional growth trials were conducted to 35 d of age, in different rearing conditions (genetic breeds, corn-soybean meal-based diet with or without animal proteins, in presence or absence of phytase, on fresh or used litter) to investigate the efficacy and the specificity of this new B. subtilis strain on the improvement of BWG and FCR of broilers in comparison with a B. subtilis-based DFM already used in the field. Whatever the rearing conditions tested, the new B. subtilis strain led to an average 3.2% improvement in feed conversion ratio or bodyweight. Comparatively, the commercial Bacillus strain significantly improved broiler performance in only one trial out of 3 with an average improvement reaching 2%. All these results indicate that this new B. subtilis strain consistently improves broiler performances.

Probiotics (Direct-Fed Microbials) in Poultry Nutrition and Their Effects on Nutrient Utilization, Growth and Laying Performance, and Gut Health: A Systematic Review

“…Generally, probiotics are used to help maintain a healthy microbial balance within the intestine to promote gut integrity and immune health. Probiotic bacteria can induce beneficial effects by producing antimicrobial substances such as SCFA and bacteriocins that limit the growth and survival of pathogenic microbes [ 77 ]. Notably, several strains of Lactobacillus have been found to lower the environmental pH through the production of lactic acid.…”

Comparison of two probiotic preparations on growth performance, intestinal microbiota, nutrient digestibility and cytokine gene expression in broiler chickens

“…It is well known that gut health is a key point for animal performance due to its critical importance on nutrient digestion, absorption and metabolism, incidence of enteric diseases, and immune responses (Yegani and Korver 2008;Hamasalim 2016). Previous studies have shown that probiotics improved broilers' growth performance and promoted greater populations of symbiotic microbiota in the intestine of broilers (Mountzouris et al 2007;Latorre et al 2017;Rhayat et al 2017). In a recent study, Shah et al (2019b) found that supplementation of Lactobacillus bacteria increased intestinal villus' height and absorptive capacity in broiler chickens that led to higher final BW of the birds.…”

Supplemental Bacillus subtilis DSM 32315 manipulates intestinal structure and microbial composition in broiler chickens

“…It was reported that the effects of B . subtilis supplementation on growth performance and intestinal physiology in broilers were markedly strain-dependent 8 , 9 , providing a need for the continuous studies on the various strains of B . subtilis to understand their respective properties in animals.…”