This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa.Mixture（202 g kg^-1 dry matter（DM））consis...This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa.Mixture（202 g kg^-1 dry matter（DM））consisting of rice straw,broccoli residue and alfalfa at the ratio of 5：4：1 was ensiled with three experimental treatments：（1）no additives（control）;（2）molasses at 2.5%（M1）;（3）molasses at 5%（M2）on a fresh matter basis of mixture,respectively.All treatments were packed into laboratory-scale silos,and three silos per treatment were sampled on days 1,3,5,14 and 30.The result showed that the p H value of all mixed silages decreased gradually with the time of ensiling except for the control silage,in which a significant increase（P〈0.05）on day 30 occurred.The lactic acid content increased gradually with the time of ensiling and reached the highest value on day 14,and a marked decrease（P〈0.05）was found in the control silage on day 30.The changes of acetic acid content showed similar pattern with lactic acid content.A trace amount of propionic and butyric acid contents were found in the three mixed silages during the fermentation period.Comparing to the control,M1 and M2 treatments improved the fermentation quality of mixed silages as indicated by higher（P〈0.05）lactic acid contents and lower（P〈0.05）p H and ammonia-N contents.The Flieg points also showed that M1 and M2 silages were well preserved,whereas the control silage had a bad quality.Overall,the findings of this study suggested that adding molasses could improve fermentation quality of mixed silage,and M1 was more suitable for practical application.展开更多
以多花黑麦草(Lolium multi florum)和水稻(Oryza sativa)秸秆为原料,按不同比例混合青贮,通过发酵品质和营养成分分析,筛选出适宜的混贮比例。结果表明;多花黑麦草单独青贮不易成功,与水稻秸秆以不同比例混合青贮均显著降低氨态氮/总...以多花黑麦草(Lolium multi florum)和水稻(Oryza sativa)秸秆为原料,按不同比例混合青贮,通过发酵品质和营养成分分析,筛选出适宜的混贮比例。结果表明;多花黑麦草单独青贮不易成功,与水稻秸秆以不同比例混合青贮均显著降低氨态氮/总氮的值以及乙酸、丙酸和丁酸的含量(P<0.05),改善了发酵品质;其中7:3混贮处理发酵品质最佳,V-Score评分等级为优。从发酵品质以及秸秆利用最大化的角度出发,建议多花黑麦草与水稻秸秆以7:3混贮作为下一步研究的基础。展开更多
基金supported by the project of Jiangsu Independent Innovation, China (CX(15)1003-3)the Key Technologies R&D Program of China during the 13th Five Year Plan period (2016YFC0502005)the special project of grass of Tibetan Autonomous Region for the “13th FiveYear” Plan, China
文摘This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa.Mixture（202 g kg^-1 dry matter（DM））consisting of rice straw,broccoli residue and alfalfa at the ratio of 5：4：1 was ensiled with three experimental treatments：（1）no additives（control）;（2）molasses at 2.5%（M1）;（3）molasses at 5%（M2）on a fresh matter basis of mixture,respectively.All treatments were packed into laboratory-scale silos,and three silos per treatment were sampled on days 1,3,5,14 and 30.The result showed that the p H value of all mixed silages decreased gradually with the time of ensiling except for the control silage,in which a significant increase（P〈0.05）on day 30 occurred.The lactic acid content increased gradually with the time of ensiling and reached the highest value on day 14,and a marked decrease（P〈0.05）was found in the control silage on day 30.The changes of acetic acid content showed similar pattern with lactic acid content.A trace amount of propionic and butyric acid contents were found in the three mixed silages during the fermentation period.Comparing to the control,M1 and M2 treatments improved the fermentation quality of mixed silages as indicated by higher（P〈0.05）lactic acid contents and lower（P〈0.05）p H and ammonia-N contents.The Flieg points also showed that M1 and M2 silages were well preserved,whereas the control silage had a bad quality.Overall,the findings of this study suggested that adding molasses could improve fermentation quality of mixed silage,and M1 was more suitable for practical application.
文摘以多花黑麦草(Lolium multi florum)和水稻(Oryza sativa)秸秆为原料,按不同比例混合青贮,通过发酵品质和营养成分分析,筛选出适宜的混贮比例。结果表明;多花黑麦草单独青贮不易成功,与水稻秸秆以不同比例混合青贮均显著降低氨态氮/总氮的值以及乙酸、丙酸和丁酸的含量(P<0.05),改善了发酵品质;其中7:3混贮处理发酵品质最佳,V-Score评分等级为优。从发酵品质以及秸秆利用最大化的角度出发,建议多花黑麦草与水稻秸秆以7:3混贮作为下一步研究的基础。
