关键词: 紫花苜蓿, 高丹草, 青贮, 营养品质, 发酵品质, 混贮比例

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