不同混合比例对象草与甘蔗梢青贮发酵品质及体外干物质消化率的影响  

Effect of different proportion levels on fermentation quality and in vitro ruminal digestion of napier grass,sugarcane top silage

作　　者：谢华德 郭艳霞[1] 彭丽娟 彭开屏 梁辛[1] 李孟伟[1] 唐振华[1] 杨承剑[1] XIE Hua-de;GUO Yan-xia;PENG Li-juan;PENG Kai-ping;LIANG Xin;LI Meng-wei;TANG Zhen-hua;YANG Cheng-jian

机构地区：[1]中国农业科学院广西水牛研究所农业农村部(广西)水牛遗传繁育重点实验室,广西南宁530001

出　　处：《饲料研究》2021年第12期93-96,共4页Feed Research

基　　金：国家重点研发计划项目(项目编号:2018YFD0501602、2016YFD0500507);广西自然科学基金面上项目(项目编号:2018GXNSFAA281162);广西水牛遗传繁育重点实验室自主课题(项目编号:2018-A-03-02);水牛所基本科研业务费项目(项目编号:200510);水牛所基本科研业务费项目(项目编号:210507);水牛所基本科研业务费项目(项目编号:200508)

摘　　要：试验研究不同混合比例对象草和甘蔗梢青贮品质及体外干物质消化率的影响。采用小规模发酵法,按象草和甘蔗梢鲜重比为100∶0、75∶25、50∶50、25∶75和0∶100 (Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ组)进行调制。每组5个重复。青贮45 d,取样测定混合青贮饲料的发酵品质、营养成分及体外干物质消化率。结果显示,Ⅱ、Ⅲ、Ⅳ和Ⅴ组青贮的p H值和氨态氮含量均显著低于Ⅰ组(P<0.05),Ⅳ和Ⅴ组青贮的乳酸含量显著高于其他各组(P<0.05)。各组间干物质和粗蛋白质含量均存在显著性差异(P<0.05),Ⅳ和Ⅴ组有机物含量显著高于其他各组(P<0.05)。体外干物质消化率最高的为Ⅳ组,但各组差异不显著(P>0.05),Ⅳ组产气量显著高于其他各组(P<0.05),Ⅱ、Ⅲ和Ⅴ组总挥发性脂肪酸和乙酸显著高于Ⅰ组(P<0.05)。研究表明,Ⅳ组混贮料pH值、氨态氮含量较低,乳酸、有机物含量、体外干物质消化率较高,青贮效果最佳。The experiment studied effect of varying proportions of napier grass and sugarcane top on fermentation quality and in vitro dry matter digestibility of mixed silage. Using small-scale fermentation, the fresh weight ratio of elephant grass and sugarcane shoots was 100∶0, 75∶25, 50∶50, 25∶75 and 0∶100(group Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ). Each group had five replicate. After 45 d of silage, sampling was taken to determine the fermentation quality, nutritional components and in vitro dry matter disappearance rate of the mixed silage. The results showed that the pH value and the content of ammonia nitrogen in group Ⅱ, Ⅲ, Ⅳ and Ⅴ were significantly lower than those of group Ⅰ(P<0.05), the lactic acid content of silage in group Ⅳ and group Ⅴ was significantly higher than that of other groups(P<0.05). There were significant differences in dry matter and crude protein content of silage among the groups(P<0.05), the organic content of silage in group Ⅳ and groupⅤ was significantly higher than that of other groups(P<0.05). The highest rate of in vitro dry matter disappearance was group Ⅳ, but the difference between the groups was not significant(P>0.05), the gas production of silage in group Ⅳ was significantly higher than that of other groups(P<0.05), the total volatile fatty acids and acetic acid of silage in group Ⅱ, Ⅲ and Ⅴ were significantly higher than those in group Ⅰ(P<0.05). The experiment indicates that the pH value and ammonia nitrogen content of silage in group Ⅳ were lower, while lactic acid, organic matter content and in vitro dry matter digestibility were higher, and silage fermentation quality of group Ⅳ was the best.

关 键 词：象草 混合青贮 甘蔗梢 发酵品质 体外干物质消化率 

分 类 号：S816.6[农业科学—饲料科学]