青贮决明(CA)可以在一定程度上缓解部分地区的饲料短缺,降低饲料成本。本研究评估了纤维素酶(CE)和植物乳杆菌(LP)对发酵参数的影响,营养素,和CA青贮饲料的细菌群落。用三种不同的处理方法对切碎的CA进行青贮,即,无接种剂(CK),CE,LP,指标在2日确定,6th,14日,和第30天的青贮饲料发酵。发酵参数表明,3组的pH值随着青贮过程的增加而降低,最低值在第14天观察到。CK和LP组在第30天达到最高值,而CE组在第二天达到最高值。此外,CE和LP组的pH值和NH3-N含量明显低于CK组(P<0.05)。在营养方面,在第30天,CE和LP组的粗蛋白(CP)含量显着增加(P<0.05)。CE组的中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量与发酵时间呈显著负相关,在青贮期间,三组的水溶性碳水化合物(WSC)含量显着降低。与CK组相比,NDF和ADF含量显著降低(P<0.05),CE组WSC含量在第30天增加(P<0.05)。细菌群落的测序分析表明,乳酸杆菌成为青贮过程中最主要的属。此外,CE和LP组均增加了乳酸杆菌的丰度,降低了克雷伯菌的丰度,Weissella,与CK组相比,其中LP效果较好。CE和LP可以进一步提高CA的青贮质量,和LP在重建青贮环境中的细菌群落中具有更显著的作用。
Silage Cassia alata (CA) can alleviate feed shortage in some areas to a certain extent and reduce feed costs. The present research evaluated the effect of cellulase (CE) and Lactiplantibacillus plantarum (LP) on the fermentation parameters, nutrients, and bacterial community of CA silage. Chopped CA was ensiled with three different treatments, namely, no inoculant (CK), CE, and LP, and the indexes were determined on the 2nd, 6th, 14th, and 30th days of silage fermentation. The fermentation parameters indicate that the pH value of the three groups decreased and then increased with the ensilage process, and the lowest value was observed on the 14th day. The CK and LP groups attained the highest value on the 30th day, while the CE group attained the highest value on the 2nd day. Additionally, the pH value and NH3-N content were significantly lower (P < 0.05) in the CE and LP groups than in the CK group. In terms of nutrients, crude protein (CP) contents significantly increased (P < 0.05) in the CE and LP groups on the 30th day. The neutral detergent fiber (NDF) and acid detergent fiber (ADF) contents of the CE group were significantly and negatively associated with fermentation time, and the water-soluble carbohydrate (WSC) contents of the three groups were significantly lower during ensiling. In comparison with the CK group, the NDF and ADF contents were significantly reduced (P < 0.05), and the WSC content increased (P < 0.05) in the CE group on day 30. Sequencing analysis of bacterial communities showed that Lactobacillus became the most dominant genus in the ensilage process. Moreover, both CE and LP groups increased the abundance of Lactobacillus and decreased that of Klebsiella, Weissella, and Acetobacter in comparison to the CK group, in which LP had a better effect. CE and LP could further improve the silage quality of CA, and LP had a more significant effect in reconstructing the bacterial community in the silage environment.