Abstract: The silage qualities of four cultivars of sorghum(cultivar Dalishi,Leshi,Tiannong1 and YiChun) with 0.3% acetic acid,0.3% propanoic acid and 0.5% urea additives were studied.All sorghum cultivars were placed in sealed vacuum plastic bags and ensiled for 60 days.Results show that acetic acid additives significantly increased the lactic acid content of silage(P<0.05).Propanoic acid additives significantly decreased pH and ammonia nitrogen content,and significantly increased the lactic acid content compared with control(P<0.05).Urea significantly increased crude protein and lactic acid contents(P<0.05).The fermentation qualities were significantly affected by both additives and sorghum cultivars(P<0.05).In summary,acetic acid,propanoic acid and urea had beneficial effects on improving the fermentation quality of sorghum silages.The fermentation quality of Dalishi and Leshi were better than that of Tiannong1 and Yichun.

Key words: Sorghum, Additives, Silage, Fermentation quality

摘要： 为探讨不同添加剂对不同高粱青贮饲料质量影响,以4个高粱品种的全株为青贮原料,设清水对照和分别添加乙酸(0.3%)、丙酸(0.3%)和尿素(0.5%)4个处理,袋装青贮60天后取样,测定其发酵品质与化学成分。结果表明:添加乙酸处理显著提高青贮饲料的乳酸含量(P<0.05);添加丙酸处理显著降低青贮饲料的pH值和氨态氮含量,却显著提高乳酸含量(P<0.05);添加尿素处理显著提高青贮饲料的粗蛋白质及乳酸含量(P<0.05)。不同品种高粱青贮饲料的发酵质量存在差异,添加剂和品种对青贮的发酵品质有交互作用。其中,品种大力士和乐食青贮饲料品质优于天农青饲1号和乙醇高粱;添加乙酸、丙酸和尿素可以改善高粱青贮饲料发酵品质。

关键词: 高粱, 添加剂, 青贮, 发酵品质