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Bao X, Feng H, Guo G, Huo W, Li Q, Xu Q, Liu Q, Wang C, Chen L. Effects of laccase and lactic acid bacteria on the fermentation quality, nutrient composition, enzymatic hydrolysis, and bacterial community of alfalfa silage. Front Microbiol 2022; 13:1035942. [PMID: 36274744 PMCID: PMC9582240 DOI: 10.3389/fmicb.2022.1035942] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
Ensiling has long been as a mainstream technology of preserving forage for ruminant production. This study investigated the effects of bioaugmented ensiling with laccase and Pediococcus pentosaceus on the fermentation quality, nutritive value, enzymatic hydrolysis, and bacterial community of alfalfa. The application of laccase and Pediococcus pentosaceus combination was more potent in modulating the fermentation quality of silage than laccase and Pediococcus pentosaceus alone, as indicated by higher lactic acid contents and lactic acid to acetic acid ratios, and lower pH, dry matter losses, and ammonia nitrogen contents. Moreover, treatments with additive enhanced protein preservation and structural carbohydrate degradation, while increasing true protein and water-soluble carbohydrate contents. By promoting lignin degradation, treatments containing laccase further facilitated the release of sugars from cellulose compared with treatment with Pediococcus pentosaceus alone. The additive treatments reduced the bacterial diversity and optimized the bacterial community composition of silage, with an increase in the relative abundance of desirable Lactobacillus and a decrease in the relative abundance of undesirable Enterobacter and Klebsiella. PICRUSt functional prediction based on Kyoto Encyclopedia of Genes and Genomes (KEGG) databases revealed that PL and LPL treatments increased the metabolism of membrane transport, carbohydrate, and terpenoids and polyketides related to fermentation activities. It can be concluded that bioaugmented ensiling with laccase and Pediococcus pentosaceus combination can be an effective and practical strategy to improve silage fermentation and nutrient preservation of alfalfa silage.
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Affiliation(s)
- Xueyan Bao
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Haoran Feng
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Gang Guo
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Wenjie Huo
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Qinghong Li
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Qingfang Xu
- College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Qiang Liu
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Cong Wang
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Lei Chen
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
- *Correspondence: Lei Chen,
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