鼠李糖乳杆菌对全株玉米青贮品质及瘤胃降解率的影响

本试验旨在研究鼠李糖乳杆菌(Lactobacillus rhamnosus GG,LGG)对全株玉米青贮品质及瘤胃降解率的影响。采用单因素试验设计,设置对照组(CON)和LGG处理组(添加105 CFU/g鲜重LGG),于0、24、36、48 d取样,测定其常规营养价值、发酵品质和瘤胃降解特性。结果表明:与CON组相比,LGG组干物质(DM)和粗蛋白质(CP)含量在48 d下降,中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)在36 d后显著降低,淀粉含量在36 d显著升高;不同天数的pH均显著下降;36 d和48 d乳酸含量显著升高,乙酸和丙酸在24 d时显著升高;氨态氮在整个发酵过程中变化不显著;LGG组DM慢速降解速率常数c和有效降解率(ED)均显著高于CON组;LGG组CP快速降解参数a、慢速降解速率常数c和ED显著升高,LGG组NDF慢速降解参数b和ED显著升高(P<0.05)。以上结果表明,鼠李糖乳杆菌能显著改善全株玉米青贮发酵品质,提高DM、CP和NDF在瘤胃内的ED。

Effects of Lactobacillus Rhamnosus on Silage Quality and Rumen Degradation Rate of Whole Plant Corn

The objective of this study was to investigate the effects of Lactobacillus rhamnosus GG(LGG) on the silage quality and rumen degradation rate of whole plant corn. Single factor experiment design was used to set the control group(CON)and LGG treatment group(add 105 CFU/g fresh weight LGG) and sample at d 0, 24, 36, 48 to determine their conventional nutritional value, fermentation quality and rumen degradation characteristics. The results showed that compared with the CON group, the dry matter(DM) and crude protein(CP) contents of the LGG group decreased at d 48(P<0.05), and the neutral detergent fibers and acid detergent fibers decreased significantly at d 36 and 48. The starch content increased significantly at d 36; the pH of different days decreased significantly; the lactic acid content increased significantly after d 36, acetic acid and propionic acid were There was a significant increase at d 24. The ammonia nitrogen did not change significantly during the whole fermentation process. The slow degradation rate constant and effective degradation rate(ED) of DM in LGG group were significantly higher than those in CON group. The rapid degradation parameters a, the slow rate degradation rate constant c and the effective degradation rate ED of the LGG group were significantly increased, and the ADF slow degradation parameter b and the effective degradation rate ED of the LGG group were increased. Lactobacillus rhamnosus can significantly improve the fermentation quality of whole plant corn silage and improve the effective degradation rate of dry matter, protein and neutral detergent fiber in the rumen.