旋扭山绿豆的营养成分及青贮发酵品质

旋扭山绿豆(Desmodium intortum)是一种优良的多年生热带豆科牧草,本研究分析了其营养成分和乳酸菌、葡萄糖添加对其青贮发酵品质的改善效果。青贮试验设有6个处理,即对照(无添加),添加乳酸菌(LAB)、1%葡萄糖(1%G)、2%葡萄糖(2%G)、乳酸菌+1%葡萄糖(LAB+1%G)和乳酸菌+2%葡萄糖(LAB+2%G)。结果显示:旋扭山绿豆的粗蛋白含量(20.75%)和水溶性碳水化合物含量(7.19%)较高;青贮60 d后,对照处理发酵品质较差,pH在4.7以上;单独添加乳酸菌显著降低了pH和氨态氮含量,增加了乳酸含量(P <0.05);而单独添加葡萄糖的两个处理pH与对照差异均不显著(P> 0.05),但均显著降低了氨态氮含量(P <0.05);乳酸菌和葡萄糖混合添加处理均使pH降至4.1以下,乳酸含量超过6%,显著优于其他处理(P <0.05),但两混合添加处理间无显著差异(P> 0.05),因此添加乳酸菌和1%葡萄糖是改善旋扭山绿豆青贮发酵品质的有效措施。

Nutrition composition and silage fermentation quality of Desmodium intortum

Desmodium intortum is an excellent perennial legume grass in tropics.The nutrition composition and chemical characteristics of Desmodium intortum were tested,and the effect of additives of lactic acid bacteria(LAB)and glucose(G)to raw materials on the quality of silage fermentation were also studied in the present experiment.The ensiling experiment was designed into 6 treatments,they were control(no additives),additives of LAB,1%G,2%G,LAB+1%G and LAB+2%G,respectively.The results showed that Desmodium intortum had high crude protein content(20.75%)and water soluble carbohydrate content(7.19%).After 60 days of ensiling,the fermentation quality of the control silage was poor,with pH over 4.7.The treatment of inoculating with LAB alone reduced pH and ammonia nitrogen content of silage significantly,and increased the lactic acid content(P<0.05),while adding glucose along with two concentrations did not reduce pH(P>0.05),but decreased the ammonia nitrogen content significantly(P<0.05)compared to the control.The silages added with the mixtures of LAB and glucose(LAB+1%G and LAB+2%G)were of pH lower than 4.1,and lactic acid content were higher than 6.0%,which were significantly better than the other treatments(P<0.05).And there was no significant differences between the two treatments(P>0.05).Thus,adding LAB and 1%G to Desmodium intortum could effectively improve the fermentation quality of the silage.