【作者】 李长春；

【导师】 贾玉山； 格根图；

【作者基本信息】 内蒙古农业大学 ， 草业科学， 2008， 硕士

【摘要】 本论文以锡林郭勒盟典型草原天然牧草为研究对象,进行了天然牧草青贮关键技术的研究,最终筛选确定适合天然牧草青贮的方式方法和关键工艺条件。(1)就天然牧草含水量、贮藏密度和外源青贮添加剂等关键影响因素,设计了三因素四水平的青贮试验。通过对比分析不同水平天然牧草青贮饲料的感官品质、主要微生物数量构成、发酵品质、营养成分和贮成率等指标,筛选适合试验区天然草地牧草青贮时的原料含水量、贮藏密度和外源添加剂使用量等工艺参数。结果表明:①天然牧草在含水量为65%～70%范围内青贮,青贮料的感官品质、发酵品质较好,贮成率较高,还可有效的保存青贮料中的营养成份,青贮料的饲用价值较高。②天然牧草青贮密度在350～400kg/m3范围内时,青贮料的感官评定、有机酸评定得分及贮成率显著高于其他水平,营养成份损失较少,纤维类物质的含量较低,可消化营养物质的含量显著高于其他水平。③添加菌剂有效地提高了天然牧草青贮料的感官品质、发酵品质、贮成率,并保存了青贮料中的营养成份。菌剂添加量0.50g/kg可消化营养物含量相对较高。(2)进行切短(4～6cm)青贮对比试验。同时,探索了天然牧草青贮饲料最佳饲喂利用时间。结果表明:将天然牧草切短青贮,青贮料的感官品质、发酵品质及营养成分含量无显著变化。天然牧草青贮料的最佳利用时间应在青贮35～120天之间。更多还原

【Abstract】 This paper was took the native grass in Xilinguole League typical prairie as the study object. The native grass silage key technology was studied and the suitable means and key technological conditions for silage were selected in the end.(1) For the key influencing factors of native grass such as moisture content, storage density and extraneous source additive, three levels and four factors was designed in this silage test. By comparing and analyzing these indexes such as sensory quality, major microorganism quantity composition, ferment quality, nutritional ingredients and silage success ratio of the native grass silage in different levels, the technical parameters such as raw materials moisture content, storage density and additive usage amount that suit for native grass silage in experimental area were screened. The results showed that:①Ensilage the native grass when its moisture content was from 65%～70%, the silage grass not only has better sensory quality, better fermentation and higher silage success ratio, but also can preserve the nutritional ingredients effectively and make the silage grass has higher feeding value.②When the silage density was in the range of 350 ~ 400 kg/m3, the score of silage grass sensory evaluation and organic acids, digest nutrient and silage success ratio were significantly higher than that of other level. Meanwhile, it has less loss of nutrients and lower fiber material content.③The additive can effectively improved the native grass silage sensory quality, fermentation quality, silage success ratio and preserve the nutrient ingredient of the silage grass. The digestible nutrient content was relatively high when the fungi amount was 0.50g/kg.(2) Make the test that cut the grass into pieces for silage and explore the best feeding time of native grass silage at the same time. The results showed that: cut the native grass into pieces for silage, the grass sensory quality, fermentation quality and nutrition components haven’t change significantly. The best use of time for native grass silage material was between 35-120 days after ensilaged.更多还原