Abstract
Sweet sorghum bagasse (SSB) is a promising raw material for silage fermentation due to its high residual nutritive, but the efficient fermentation strategy of SSB has not been reported yet. This study evaluated the effects of microbial inoculant on the fermentation quality, chemical composition and microbial community of SSB silage. The silage inoculated with isolated lactic acid bacteria (LpE) achieved better fermentation than that of commercial inoculant A, B (CIA, CIB) and untreatment, including low pH value, high levels of lactic acid and water soluble carbohydrates (WSC) content, which demonstrated that the LpE inoculant could contribute to the preservation of nutrition and the manipulation of fermentation process of SSB. In addition, the results of microbial community analysis indicated that the LpE inoculant significantly changed the composition and diversity of bacteria in SSB silage. After ensiling, the LpE inoculated silage were dominated by Lactobacillus(95.71%), Weissella(0.19%). These results were of great guiding significance aiming for high-quality silage production using SSB materials on the basis of target-based regulation methods.
Highlights
Sweet sorghum bagasse (SSB) is a promising raw material for silage fermentation due to its high residual nutritive, but the efficient fermentation strategy of SSB has not been reported yet
The contents of neutral detergent fiber (NDF) and acid detergent fiber (ADF) in SSB were 803.23 g/kg and 558.66 g/kg of Dry matter (DM), which were lower compared with the results reported by dos Passos Bernardes et al.[21]
This study comprehensively analyzed the effects of microbial inoculants on the fermentation characteristic and microbial community of SSB silage
Summary
Sweet sorghum bagasse (SSB) is a promising raw material for silage fermentation due to its high residual nutritive, but the efficient fermentation strategy of SSB has not been reported yet. The LpE inoculated silage were dominated by Lactobacillus(95.71%), Weissella(0.19%) These results were of great guiding significance aiming for high-quality silage production using SSB materials on the basis of target-based regulation methods. Microbial community of silage was originally studied using classical microbiological or molecular techniques, such as plate count of culture-based, denaturing gradient gel electrophoresis (DGGE) by PCR-amplified[17]. These studies could provide a information on the microbial community of silage, its Itemsa DM (%, FM) pH WSC (g/kg, DM) NDF (g/kg, DM) ADF (g/kg, DM) Hemicellulose (%) Lignin (%) Cellulose (%) LAB (Log cfu/g FM−1) Yeast (Log cfu/g FM−1) Mold (Log cfu/g FM−1) Coliform (Log cfu/g FM−1). The generation sequencing (NGS) technology was applied in the study to characterize the microbial communities associated with the SSB fermentation[19,20]
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