全株玉米添加酶制剂青贮效果研究

Study on the effect of adding enzyme in whole-cropcorn silage

以全株玉米为原料,分别添加酶制剂0(C),800(1),1300(2),1800(3)g/t DM进行青贮.结果表明,全株玉米各处理青贮料乳酸含量大于110 g/kg DM,NH3/TN比值和pH值分别低于7%和3.8,且都未产生丁酸,均属于优质青贮料.添加酶后,显著降低了青贮料的中性洗涤纤维(NDF)的含量.干物质在瘤胃48 h降解率(DMD48),1,2,3组均显著高于对照组(P<0.01),以添加1300 g/t DM酶时最高,比对照组高15.4%.添加酶还提高了青贮料按产气量估算的有机物消化率(OMD)和48 h产气量(GP48).添加酶制剂可提高青贮全株玉米的营养价值,以1300 g/t DM的添加量为佳.

Whole-crop corn was ensiled with an experimental preparation of cell-wall degrading enzymes at four levels respectively： 0 （control, C）, 800 （1）, 1300 （2）, 1800 （3） g/t DM. The result showed that all whole-crop corn silages were well preserved with low pH, low ammonia nitrogen （NHs-N） and high lactic acid content. The fermentation quality showed no significant difference between the four groups. However, addition of enzyme decreased obviously the content of neutral detergent fiber （NDF）. Enzyme addition improved the silage＇s nutritive value by increasing in vitro organic matter digestibility （OMD）, in vitro gas production at 48 h （GP48） and in sacco degradation of DM at 48 h incubation （DMD48）, and the DMD48 in group 2 was the highest and 15.4% higher than that in the control （P〈0.01）. In conclusion, the best nutritive value of whole-crop corn silage can be obtained when enzyme was added at the level of 1300g/t DM.