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草业学报 ›› 2014, Vol. 23 ›› Issue (3): 248-254.DOI: 10.11686/cyxb20140329

• 论文 • 上一篇    下一篇

糖蜜添加对西兰花茎叶稻秸苜蓿混合青贮发酵品质的影响

王坚1,2,王亚琴3,闻爱友1,邵涛1,*   

  1. 1.南京农业大学动物科技学院,江苏 南京 210095;
    2.海南大学农学院,海南 海口 570228;
    3.宁波市畜牧兽医局,浙江 宁波315102
  • 收稿日期:2013-04-12 出版日期:2014-06-20 发布日期:2014-06-20
  • 通讯作者: E-mail:taoshaolan@163.com
  • 作者简介:王坚(1973-),男,广西玉林人,讲师,在读博士。E-mail:wangjian901@163.com
  • 基金资助:
    国家自然基金(30771530)和宁波市农科教结合项目(2009NK38)资助

Effects of molasses addition on the fermentation quality of broccoli residue, rice straw and alfalfa mixed silage

WANG Jian1,2,WANG Ya-qin3,WEN Ai-you1,SHAO Tao1   

  1. 1.College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;
    2.College of Agriculture, Hainan University, Haikou 570228, China;
    3.Animal Husbandry and Veterinary Bureau of Ningbo City, Ningbo 315102, China
  • Received:2013-04-12 Online:2014-06-20 Published:2014-06-20

摘要: 本试验目的是评价糖蜜添加对西兰花茎叶稻秸苜蓿混合青贮发酵品质的影响,试验设3个处理,即糖蜜添加为0(对照组),2.5%,5.0%,添加比例以鲜重为基础。在青贮后的第1,3,5,7,14和30天打开青贮罐,测定青贮饲料发酵品质。结果表明,对照组pH值在青贮发酵最初14 d缓慢下降,青贮第30天,对照组的pH值显著上升到4.96(P<0.05),糖蜜添加组pH值从第3天开始随青贮时间增加而显著降低(P<0.05),30 d后,pH值均低于4.0。在青贮的第14天,所有处理组乳酸含量均达到其最大值,分别为50.82,84.84,86.64 g/kg DM。所有处理组乙酸和挥发性脂肪酸含量均随着青贮时间的增加而逐渐增加。在青贮发酵过程中所有处理组丙酸和丁酸均未检出或少量检测到。与对照组相比,糖蜜添加显著(P<0.05)提高了乳酸/乙酸、乳酸含量,同时显著(P<0.05)降低了pH值、氨态氮/总氮和丁酸含量;但2.5%和5.0%糖蜜添加青贮在pH值、乳酸/乙酸、乳酸含量、氨态氮/总氮和丁酸含量上无显著差异。综上所述,添加2.5%糖蜜即可提高混合青贮发酵品质。

Abstract: The aim of this study was to evaluate the effects of adding molasses on the fermentation of rice straw, alfalfa and broccoli residues mixture silage. The three treatments were: no molasses (control), and addition of 2.5% or 5.0% molasses (on a fresh weight basis). The silos were opened on 1, 3, 5, 7, 14 and 30 days after ensiling and the silage fermentation quality was evaluated. The pH of the control decreased slowly but after the first 14 days of post-ensiling, had significantly (P<0.05) increased to 4.96 by day 30. The pH under molasses addition decreased significantly (P<0.05) from 3 days of ensiling and was below 4.0 at the end of ensilage. The content of lactic acid in all treatments reached the highest value (50.82,84.84,86.64 g/kg DM, respectively) on day 14. The contents of acetic acid and volatile fatty acids in all treatments continuously increased until the end of the experiment. Propionic and butyric acids in all treatments were absent or detected in small amounts only during the ensiling period. Molasses addition significantly (P<0.05) increased the ratios of lactic acid/acetic acid and also the contents of lactic acid, but significantly (P<0.05) decreased pH, NH3-N/TN and butyric content compared with the control. There were no significant differences in pH, lactic acid/acetic acid, lactic content, NH3-N/TN and butyric content between treatments. In conclusion, molasses addition at 2.5% improved the ensiling fermentation of mixed ensilage of broccoli residue, rice straw and alfalfa.

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