摘要
本试验研究添加乳酸菌制剂(FS)、绿汁发酵液(PFJ)、蔗糖(S)和乳酸菌制剂+蔗糖(FS+S)对青贮苜蓿发酵品质及其发酵动态的影响。试验设计分为对照组、FS(0.000 5%)、PFJ(0.2%)、S(1%)、FS+S(0.000 5%+1%)5个组,分别在贮藏后的第2天、第5天、第10天、第15天、第30天和第45天开封,分析青贮饲料的发酵品质。结果表明:添加剂对青贮苜蓿发酵品质有改善作用,改善效果的顺序为:FS+S>S>PFJ>FS;添加乳酸菌组青贮初期乳酸菌数目多,青贮45 d后所有添加剂组的乳酸菌数目高于对照组;对照组的pH仅在青贮前5 d短暂降低,此后不断上升,各添加剂组青贮初期pH下降幅度较对照组大,并稳定保持了低pH趋势;有机酸含量及组成的变化良好的契合了pH动态;所有组的氨态氮在青贮过程中均逐渐上升,对照组尤为明显,所有添加剂组第10天后增加极其缓慢。由此可见,添加剂有助于提高青贮品质,且同时添加乳酸菌和蔗糖的效果最好。
The experiment was carried out to study the effects of adding lactic acid bacteria （LAB） （fast-sile, FS）, previous fermented juice （PFJ）, sucrose （S） and FS ＋ S on the fermentation quality and the amount of LAB during ensiling of alfalfa silage. There were 5 groups including control, FS （0. 000 5%）, PFJ （0.2%）, S （1%） and FS＋ S （0. 000 5% ＋ 1%）, respectively. The fermentation qualities were analyzed on day 2, 5, 10, 15, 30 and 45 after ensiling, respectively. The effects of additives on fermentation quality of alfalfa silage were observed. The sequence for the effects of additives was： FS ＋ S〉S〉 PFJ〉FS. The amount of LAB in all additive groups was higher than that in control group after the storage of 45 days （P〈 0.05）. There was higher amount of LAB in FS group compared with the other groups. The pH in control group decreased during the first 5 days, and then increased gradually until the end of ensiling. The pH in additive groups decreased quickly, and then kept at the low level during ensiling. The changes of organic acid composition were consistent with the change of trends of pH. NH3-N/total N in all groups increased gradually, which increased slowly after 10 days, whereas that in the control group showed greatly increase. In conclusion, additives contributed to improving quality of ensiling, and advancing effect of supplementation of LAB and sucrose simultaneously was best in all groups.
出处
《动物营养学报》
CAS
CSCD
北大核心
2009年第5期755-762,共8页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
Commonweal scientific research project "Technological Research and Demonstration of Forage Production of Artificial Grassland" (nyhyzx07-022)
national scientific planning project "Technological Integration and Industrialization Demonstration of Forage Fertility" (2006BAD16B08)
"Research and Development of Feed Technology of Dairy Cow"(2006BAD04-06-06)
关键词
青贮苜蓿
添加剂
发酵品质
Alfalfa silage
Additives
Fermentation quality
