| 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(200～250，250～300，300～350，350～400 kg/m3)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300～350 kg/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30.90 g/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54.00 g/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2.10 mg/g，未检测到AA、BA。【结论】天然牧草在密度300～350 kg/m3、添加2 mL/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。 |
| 关键词: 天然牧草 青贮 裹包层数 裹包密度 饲料品质 |
| DOI： |
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| 基金项目:国家自然科学基金项目（31460638）；农业部公益性行业专项（201303061） |
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| Influence of wrapping density and number of layers on quality of baled natural grass silage |
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DU Zhumei,JIA Yushan,ZHOU Tianrong,et al
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| Abstract: |
| 【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 2 factors influencing the quality of natural grass silage,wrapping density (200－250,250－300,300－350,and 350－400 kg/m3) and number of layers (2 layers,3 layers,and 4 layers).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 300－350 kg/m3 and 4 layers had the highest DM,CP and WSC contents of 439.51,113.37 and 39.90 g/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 54.00 g/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 2.10 mg/g,which was significantly higher than other treatments.AA and BA were not detected.【Conclusion】The wrapping density of 300－350 kg/m3,propionic acid amount of 2 mL/kg and at least 4 wrapping layers had good silage quality for natural grasses. |
| Key words: natural grass silage wrapping density wrapping layer feed quality |
