【摘要】 采用2×3 2因子随机试验设计,研究添加尿素和甜菜粕对水葫芦茎叶青贮发酵品质的影响.尿素添加水平设为0%、0.2%(按预干料计),甜菜粕添加水平设为0%、4%、8%(按预干料计).将预干的水葫芦与添加物均匀混合后装入青贮袋(29 cm×33 cm)内抽真空室温保存,60 d后开袋检测.结果表明:单独添加甜菜粕可显著提高水葫芦青贮料的干物质含量(P<0.05),但显著降低了粗蛋白(CP)含量(P<0.05);单独添加尿素可显著提高水葫芦青贮料的CP含量(P<0.05),但青贮料的感观品质不佳;无论尿素添加与否,添加4%甜菜粕的水葫芦青贮料的营养价值和感官品质均优于添加8%甜菜粕的青贮料;添加4%甜菜粕与0.2%尿素混合青贮可以显著提高青贮料CP含量和有机物消化率(P<0.05).综合考虑各项指标,4%甜菜粕组与4%甜菜粕+0.2%尿素组可获得较优的青贮效果.更多还原

【Abstract】 The effect of addition of urea and beet pulp on silage quality and rumen fermentation characteristics of water hyacinth stem and leaf was determined.The experiment was assigned to six treatments in a 2×3 factorial arrangement with urea(0%,0.2% of prewilted material) and beet pulp(0%,4% and 8% of prewilted material).The raw material and additives were mixed and put into vacuum storage bags together at room temperature.After ensiled for 60 days,the silage quality was evaluated.The results showed that the dry matter of silage was increased by addition of beet pulp(P<0.05),but the crude protein(CP) was decreased(P<0.05).The treatments with urea only had the higher proportion of CP(P<0.05),but the apparent characteristics was poor.No matter with or without urea,the dietary value and silage apparent characteristics of water hyacinth stem and leaf with beet pulp at lower adding lever(4%) was superior to the higher adding lever(8%).The crude protein and organ matter digestibility rate were increased significantly by adding with 4% beet pulp and 0.2% urea(P<0.05).In conclusion,the two treatments added with 4% beet pulp had the better silage quality.更多还原