裹包密度和层数对天然牧草青贮饲料品质的影响  

Influence of wrapping density and number of layers on quality of baled natural grass silage

作　　者：杜珠梅 贾玉山[1] 周天荣[1] 侯美玲[1] 郎巴达拉呼 格根图[1] DU Zhumei JIA Yushan ZHOU Tianrong HOU Meiling LANGBADA Lahu GE Gentu(College of Grassland ,Resources and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China Ewenk Grassland Station, Hulun Buir, Inner Mongolia 021512, China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010019 [2]鄂温克旗草原站,内蒙古呼伦贝尔021512

出　　处：《西北农林科技大学学报（自然科学版）》2017年第3期37-42,共6页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金项目(31460638);农业部公益性行业专项(201303061)

摘　　要：【目的】筛选天然牧草最佳裹包密度及裹包膜层数,为天然牧草裹包青贮提供科学依据。【方法】针对影响天然牧草裹包饲料饲用品质的裹包密度(200~250,250~300,300~350,350~400kg/m^3)和裹包膜层数(2,3和4层)2个因素设计试验,对不同处理天然牧草青贮饲料的营养指标(干物质(DM)、粗蛋白质(CP)、可溶性碳水化合(WSC)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、粗灰分(CA)、粗脂肪(EE)含量)及发酵品质(pH及乳酸(LA)、乙酸(AA)、丙酸(PA)、丁酸(BA)含量)进行分析。【结果】裹包密度为300~350kg/m3、裹包膜层数为4层的处理天然牧草青贮饲料DM、CP和WSC含量最高,分别为439.51,113.37和30.90g/kg,均显著高于其他处理;NDF、ADF和CA含量最低,分别为500.36,305.47和54.00g/kg,显著低于其他处理;EE和PA含量与其他处理差异不显著;pH值为4.69,显著低于其他处理;LA含量显著高于其他处理,为2.10mg/g,未检测到AA、BA。【结论】天然牧草在密度300~350kg/m3、添加2mL/kg丙酸的条件下进行4层裹包,所得的裹包青贮饲料品质较好。【Objective】This study screened optimum wrapping density and number of layers of natural grass to provide scientific basis for natural grass silage.【Method】The experiments were designed according to 2factors influencing the quality of natural grass silage,wrapping density（200-250,250-300,300-350,and 350-400kg/m3）and number of layers（2layers,3layers,and 4layers）.The nutritional indexes（DM,CP,WSC,NDF,ADF,CA,and EE content）and fermentation quality（pH and LA,AA,PA,BA content）were analyzed.【Result】Treatment with wrapping density of 300-350kg/m3 and 4layers had the highest DM,CP and WSC contents of 439.51,113.37 and 39.90g/kg,respectively,they all significangly higher than other rteatments;The silage NDF,ADF and CA contents were the lowest of 500.36,305.47 and 54.00g/kg,respectively,which all significantly lower than other treatments;The EE and PA contents were not significantly different from other treatment.The pH value was 4.69,which was significantly lower than other treatments,and LA content was 2.10mg/g,which was significantly higher than other treatments.AA and BA were not detected.【Conclusion】The wrapping density of 300-350kg/m3,propionicacid amount of 2mL/kg and at least 4wrapping layers had good silage quality for natural grasses.

关 键 词：天然牧草 青贮 裹包层数 裹包密度 饲料品质 

分 类 号：S816.5[农业科学—饲料科学]