摘要
为了提高典型草原天然牧草青贮品质,针对原料水分、装填密度、附着乳酸菌数量以及可溶性糖含量等影响青贮发酵品质的因素,设计4因素3水平正交试验,对青贮饲料的营养成分和发酵品质进行分析。结果表明:(1)天然牧草青贮技术有效的降低了原料中的NDF和ADF含量;(2)第5组青贮饲料的CP含量最高,VFA检测中仅含有乙酸,氨态氮/总氮最低,显著低于其他处理(P<0.05);(3)不同青贮条件对乳酸产生量影响的作用顺序依次为乳酸菌添加量>水分>蔗糖添加量>密度。综上所述,采用原料水分为600g/kg、装填密度为350kg/m3、乳酸菌添加量为0.5g/kg、蔗糖添加量为15g/kg的青贮条件,天然牧草青贮饲料的营养价值最高,发酵品质最好。
Aiming at the factors affecting natural grass ensiling quality, ie. moisture, density, lactic acid bacteria and sugar content, four factors three levels orthogonal experiment including nine treatments repeated 3 times was designed to analyze nutritional ingredients and fermentation quality of silage so as to improve the quality of natural grass ensil!ng. The results showed that=（1） The content of NDF and ADF of natural grass silage was significantly lower than raw material; （2） the fifth group silage whose CP con- tent was the highest and ammonia nitrogen/total nitrogen was significantly lower than other treatments （P 0.05） ,on different ens y contained acetic acid by VFA detection; （3）the order of effect on lactic acid production in ling condition was = lactic acid bacteria additive amount~ moisture~ cane sugar additive a- mount~ density. In conclusion, under the conditions of moisture content（600 g/kg） ,density（350 kg/m3）, lactic acid bacteria additive amount（0.5 g/kg） and cane sugar additive amount（15 g/kg）, nutritive value of silage was the highest and fermentation quality was the best.
出处
《中国草地学报》
CSCD
北大核心
2014年第1期64-68,共5页
Chinese Journal of Grassland
基金
国家现代牧草产业技术体系(CARS-35)
公益性行业(农业)科研专项经费项目(201303061)
关键词
青贮
发酵品质
乳酸
Silage
Fermentation quality
Lactic acid bacteria
