Jiang Fu-Gui, Cheng Hai-Jian, Liu Dong, Wei Chen, An Wen-Juan, Wang Ya-Fang, Sun Hai-Tao, Song En-Liang
Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.
Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China.
Front Microbiol. 2020 Dec 4;11:593088. doi: 10.3389/fmicb.2020.593088. eCollection 2020.
We investigated the variation in microbial community and fermentation characteristics of whole-plant corn silage after treatment with lactic acid bacteria (LAB) and organic acids. The fresh corn forages were treated with a combination of and (10 CFU/g fresh material) or a 7:1:2 ratio of formic acid, acetic acid, and propionic acid (6 mL/g fresh material) followed by 45 or 90 days of ensiling. Silages treated with LAB showed increased lactic acid content and decreased pH after 45 days. Although treatment with LAB or organic acids decreased the common and unique operational taxonomic units, indicating a reduction in microbial diversity, the relative abundance of was elevated after 45 and 90 days compared with control, which was more distinct in the organic acid groups. Moreover, we found higher levels of acetic acid and increased abundance of in silages treated with organic acids whereas undesirable microorganisms such as , , and were reduced. In summary, the quality of corn silages was improved by LAB or organic acid treatment in which LAB more effectively enhanced lactic acid content and reduced pH while organic acid inhibited the growth of undesirable microorganisms.
我们研究了用乳酸菌（LAB）和有机酸处理后全株玉米青贮饲料的微生物群落变化及发酵特性。将新鲜玉米饲料用LAB（10 CFU/g新鲜物料）或甲酸、乙酸和丙酸按7:1:2比例（6 mL/g新鲜物料）进行组合处理，随后青贮45天或90天。经LAB处理的青贮饲料在45天后乳酸含量增加，pH值降低。虽然用LAB或有机酸处理会减少常见和独特的操作分类单元，表明微生物多样性降低，但与对照相比，45天和90天后 的相对丰度升高，在有机酸组中更为明显。此外，我们发现用有机酸处理的青贮饲料中乙酸含量较高， 的丰度增加，而诸如 、 和 等不良微生物减少。总之，LAB或有机酸处理提高了玉米青贮饲料的质量，其中LAB更有效地提高了乳酸含量并降低了pH值，而有机酸抑制了不良微生物的生长。
