Evaluation of molasses on fermentation profiles of wheat straw ensiled with tall fescue in the southwest Tibet
文献类型： 外文期刊
作者： Dong, Dong 1 ; Dai, Tongtong 1 ; Zong, Cheng 1 ; Yin, Xuejing 1 ; Bao, Yuhong 2 ; Shao, Tao 1 ;
作者机构： 1.Nanjing Agr Univ, Inst Ensiling & Proc Grass, Coll Agrograssland Sci, Weigang 1, Nanjing 210095, Peoples R China
2.Tibet Acad Agr & Anim Husb Sci, Inst Grassland Sci, Lhasa, Peoples R China
关键词： fermentation quality; mixed ensilage; molasses; tall fescue; wheat straw
期刊名称：JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION （ 影响因子：2.718； 五年影响因子：2.747 ）
ISSN： 0931-2439
年卷期：
页码：
收录情况： SCI
摘要： Two experiments were carried out to determine the optimal proportion of mixed silage made with wheat straw and tall fescue, and further to evaluate the effects of molasses on fermentation quality. In Experiment 1, wheat straw and tall fescue were mixed at proportions of 10:0 (Control), 8:2 (WT20), 6:4 (WT40) and 4:6 (WT60) on fresh weight (FW) basis. Inclusion of tall fescue significantly (p < 0.05) increased lactic acid, water-soluble carbohydrate contents and ratio of lactic to acetic acid, and significantly (p < 0.05) decreased pH and contents of dry matter, NH3-N and volatile fatty acids. WT60 had the highest (p < 0.05) lactic acid content, and the lowest (p < 0.05) pH and butyric acid content. In Experiment 2, the mixture of wheat straw and tall fescue (4/6) were treated with 0%, 3%, 4% and 5% molasses on FW basis (defined as control, WTM3, WTM4 and WTM5 respectively). Molasses addition significantly (p < 0.05) increased lactic acid and water-soluble carbohydrate contents, and significantly (p < 0.05) decreased pH and ammonia-nitrogen content as compared with control. Acetic acid content slightly (p > 0.05) decreased during ensiling, while trace amounts of propionic and butyric acids were observed. WTM5 had the lowest pH and the highest (p < 0.05) lactic acid, water-soluble carbohydrate contents and ratio of lactic to acetic acid at end of ensiling. In conclusion, the fermentation quality was maximally improved when the addition rate of molasses was 5% in 40% wheat straw ensiled with 60% tall fescue.
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