选取3头安装有永久性瘤胃瘘管的荷斯坦牛,采用尼龙袋法评定苜蓿、无芒雀麦和玉米青贮的干物质(DM)、粗蛋白(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的瘤胃降解特性和有效降解率.结果表明:(1)苜蓿DM和CP有效降解率均在50%以上,显著高于其他粗饲料(P<0.05),3种粗饲料的DM有效降解率由高到低依次为苜蓿>无芒雀麦>玉米青贮,CP有效降解率由高到低依次为苜蓿>玉米青贮>无芒雀麦,且不同粗饲料间均差异显著(P<0.05).(2)NDF和ADF有效降解率均以玉米青贮最高,苜蓿最低,3种粗饲料中NDF和ADF有效降解率由高到低均为玉米青贮>无芒雀麦>苜蓿(P<0.05).%Three Holstein cows installed rumen fistula (650±50kg) were selected to evaluate the ruminal degradation characteristics and effective degradation rates of alfalfa, awnless brome and corn silage with the nylon bag technique. The resluts showed that: (1) The effective degradation rates of alfalfa DM and CP were all above 50%, which were significantly higher than the other roughages (P<0.05). The effective degradation rates of three kinds of roughages DM from high to low in the order were alfalfa > awnless brome > corn silage, while of CP from high to low in the order were alfalfa> corn silage > awnless brome, and the differences were significant between different roughages (P<0.05). (2) The highest effective degradation rates of NDF and ADF were both in the corn silage, while the lowest were both in the alfalfa. The effective degradation rates of three kinds of roughages NDF and ADF from high to low in the order were corn silage > awnless brome > alfalfa (P<0.05).
展开▼
