尿素对紫花苜蓿和稻秸与豆粕混合青贮的影响  

Effect of urea on mixed silage from alfalfa,rice straw and soybean meal

作　　者：谢展 穆麟[1] 张志飞[1] 刘洋 高帅 魏仲珊 XIE Zhan;MU Lin;ZHANG Zhifei;LIU Yang;GAO Shuai;WEI Zhongshan(College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China;Hunan Deren Husbandry Science and Technology Co.Ltd,Changde,Hunan 415921,China)

机构地区：[1]湖南农业大学农学院,湖南长沙410128 [2]湖南德人草业科技发展有限公司,湖南常德415921

出　　处：《湖南农业大学学报（自然科学版）》2022年第4期483-487,共5页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：湖南省重点研发计划项目(2020NK2061);湖南省科技计划项目(2020NK3008)。

摘　　要：以质量比为8∶1∶1的紫花苜蓿、水稻秸秆、豆粕为混合青贮原料,分别添加0.0(CK)、1.5(U1)、3.0(U2)、4.5 g/kg(U3)尿素进行混合青贮发酵,探讨尿素对混合青贮的发酵品质、营养品质和有氧稳定性的影响。结果表明:随尿素添加量的增加,混合青贮的氨态氮质量分数和pH值显著(P<0.05)升高,V–score均在83以上,青贮发酵品质等级为优;添加尿素处理的干物质损失率显著(P<0.05)低于CK的;U1的酸性洗涤纤维质量分数显著(P<0.05)低于其他处理的,U1的中性洗涤纤维质量分数低于CK的,U1的相对饲料价值最高,为213.69;U1的有氧稳定性在8 d以上。可见,紫花苜蓿、水稻秸秆、豆粕以质量比8∶1∶1混合青贮时添加1.5 g/kg尿素的青贮效果最好。Alfalfa,rice straw and soybean meal with a mass ratio of 8∶1∶1 were mixed,and applied by 0.0(CK),1.5(U1),3.0(U2),4.5 g/kg(U3)of urea respectively for four groups to prepare mixed silage with an aim to investigate the effect of urea on fermentation quality,nutritional quality and aerobic stability.The results showed that the ammonia nitrogen mass fraction and pH value of mixed silage increased significantly(P<0.05)over the urea increase.The V-score of all treatments were above 83,and the fermentation quality of all treatments were excellent.Meanwhile,the urea-treated treatments dry matter loss rate were significantly(P<0.05)lower than that of CK and the mass fraction of acid detergent fiber in U1 was significantly(P<0.05)lower than other treatments with the mass fraction of neutral detergent fiber in U1 lower than that in CK.And the relative feed value of U1 was the highest,which was 213.69.The aerobic stability of U1 was above 8 d.Conclusively,it can be seen that when alfalfa,rice straw and soybean meal are mixed silage at a mass ratio of 8∶1∶1,1.5 g/kg urea has the best effect.

关 键 词：紫花苜蓿 豆粕 水稻秸秆 混合青贮 尿素 V–score 相对饲料价值 pH值 

分 类 号：S816.53[农业科学—饲料科学]