Improvement of fermentation quality and cellulose convertibility of Napier grass silage by inoculation of cellulolytic bacteria from Tibetan yak ( Bos grunniens )

作者：Junfeng Li, Xiaoyue Tang, Jie Zhao, S. Chen, Siran Wang, Tao Shao · 发表于：Journal of Applied Microbiology · 年份：2020 · DOI：10.1111/jam.14917 · 被引用次数：23 · 研究领域：Ruminant Nutrition and Digestive Physiology、Probiotics and Fermented Foods、Anaerobic Digestion and Biogas Production

To isolate and identify cellulolytic bacteria from yak rumen and further evaluate the effects of the isolates on the silage quality, structural carbohydrates degradation and cellulose convertibility of Napier grass silage. Two out of 218 strains were selected based on their most extensive transparent zone and the highest filter paper disintegration rate. The two isolates (JFL12 and JF85) could grow normally at 15–55°C, pH 3·0–7·0 and NaCl (3·0, 6·5%), and were identified as Enterococcus casseliflavus and Enterococcus faecalis by 16S rDNA sequence analysis, respectively. Napier grass was ensiled with no additive control (C), Lactobacillus plantarum (Lp), JFL12, JF85, JFL12 + Lp and JF85 + Lp for 3, 5, 7, 14, 30 and 60 days. All inoculated silages had higher lactic acid content, lower pH, ammonia nitrogen (NH3‐N) and lignocellulose contents than the control silage. Silages treated with JFL12 + Lp and JF85 + Lp had the lowest pH and NH3‐N contents, the highest lactic acid content and lignocellulose degradation among all treatments. The isolates with or without Lp significantly (P < 0·01) increased water soluble carbohydrates (WSC), glucose, fructose and sucrose contents as compared with the control silage. Silages treated with JFL12 + Lp and JF85 + Lp had higher glucose yield and cellulose convertibility than the other silages. Therefore, the application of isolates (JFL12 and JF85) with Lp had synergistic effects on accelerating the degradation of structural carbohydrates and i...