Zhao G, Wu H, Li L, He J, Hu Z, Yang X, Xie X. Effects of applying cellulase and starch on the fermentation characteristics and microbial communities of Napier grass (
Pennisetum purpureum Schum.) silage.
JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2021;
63:1301-1313. [PMID:
34957445 PMCID:
PMC8672258 DOI:
10.5187/jast.2021.e107]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 07/06/2021] [Accepted: 09/19/2021] [Indexed: 11/29/2022]
Abstract
This study investigated the effects of applying cellulase and starch on the
fermentation characteristics and microbial communities of Napier grass silage
after ensiling for 30 d. Three groups were studied: No additives (control);
added cellulase (Group 1); and added cellulase and starch (Group 2). The results
showed that the addition of cellulase and starch decreased the crude protein
(CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and pH
significantly (p < 0.05) and increased water-soluble
carbohydrate (WSC) content (p < 0.05). The addition of
additives in two treated groups exerted a positive effect on the lactic acid
(LA) content, lactic acid bacteria (LAB) population, and lactic acid / acetic
acid (LA/AA) ratio, even the changes were not significant (p
> 0.05). Calculation of Flieg’s scores indicated that cellulase
application increased silage quality to some extent, while the application of
cellulase and starch together significantly improved fermentation
(p < 0.05). Compared with the control, both additive
groups showed increased microbial diversity after ensiling with an abundance of
favorable bacteria including Firmicutes and Weissella, and the
bacteria including Proteobacteria, Bacteroidetes, Acinetobacter
increased as well. For alpha diversity analysis, the combined application of
cellulase and starch in Group 2 gave significant increases in all indices
(p < 0.05). The study demonstrated that the
application of cellulase and starch can increase the quality of Napier grass
preserved as silage.
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