Abstract:  In order to explore the changes of sensory,nutritional and fermentation quality of Sorghum hybrid Sudan grass and alfalfa silage in different mixed proportions,three mixed silage treatments(60% Sorghum hybrid Sudan grass+40% alfalfa mixed silage,50% Sorghum hybrid Sudan grass+50% alfalfa mixed silage,40% Sorghum hybrid Sudan grass+60% alfalfa mixed silage) were set,with separate silage of Sorghum hybrid Sudan grass and alfalfa as the control groups,and sensory,nutritional and fermentation qualities were evaluated.The results showed that the sensory quality of 60% Sorghum hybrid Sudan grass+40% alfalfa mixed silage was the best among the three mixed silage treatment groups (the second grade was good).The contents of CP,WSC,NDF,ADF,Ash and EE of Sorghum hybrid Sudan grass+alfalfa mixed silage were between those of Sorghum hybrid Sudan grass and alfalfa single silage.The treatment of 60% Sorghum Hybrid Sudan grass + 40% alfalfa was the best among the three mixed silage treatment groups,with V-Score>80 (grade good) and Kaiser score of 100 (grade 1).Therefore,the mixed silage can not only effectively solve the problems of low success rate to silage of alfalfa and low protein content and high acidity of Sorghum hybrid Sudan grass, but also provide more comprehensive and balanced nutrition.In the mixed silage groups,60% Sorghum hybrid Sudan grass+40% alfalfa mixed silage has the best quality.

Key words: Alfalfa, Sorghum hybrid Sudan grass, Silage, Nutritional quality, Fermentation quality;Proportion of mixed silage

摘要： 为探究不同比例紫花苜蓿和高丹草混贮饲料的感官、营养和发酵品质的变化，以高丹草、紫花苜蓿单一青贮为对照组，设置3种混合青贮处理（60%高丹草+40%紫花苜蓿混合青贮、50%高丹草+50%紫花苜蓿混合青贮、40%高丹草+60%紫花苜蓿混合青贮），并对其感官、营养和发酵品质进行评定。结果显示，在3种混贮处理组中，60%高丹草+40%紫花苜蓿混合青贮的感官品质最佳（二级良好）；高丹草与紫花苜蓿混合青贮后，粗蛋白、可溶性碳水化合物、中性洗涤纤维、酸性洗涤纤维、粗灰分和粗脂肪含量介于高丹草单一青贮和紫花苜蓿单一青贮；在3种混贮处理组中，60%高丹草+40%紫花苜蓿处理效果最佳，V-Score评分大于80（等级为良好），Kaiser评分为100（等级为1级）。由此可见，混合青贮不但可有效解决紫花苜蓿草不易青贮和高丹草青贮蛋白质含量低、酸度大的问题，而且营养更加全面、均衡。在混合青贮组中，60%高丹草+40%紫花苜蓿混合青贮品质最优。

关键词: 紫花苜蓿, 高丹草, 青贮, 营养品质, 发酵品质, 混贮比例