木聚糖酶对稻草青贮饲料品质的影响

Effects of Xylanase on Quality of Rice Straw Silage

为探明木聚糖酶(Xylanase,XYL)添加水平对稻草(Rice straw)青贮品质的影响,在常规水分和低水分青贮中均设对照和分别添加20、40、80 mg/kg木聚糖酶的4个处理组,分别为CON组和XYL1组、XYL2组、XYL3组,均设3个重复,贮存60天开封后测定发酵品质和化学成分。结果表明,较常规水分青贮,低水分青贮的p H升高(P<0.01)、干物质回收率(DMR)增加(P<0.01)。常规水分青贮中,添加木聚糖酶提高了可溶性碳水化合物(WSC)和DMR含量(P<0.01,P<0.05);XYL3组的DMR最高,气体损失率(GLR)和氨态氮(NH3-N)最少。低水分青贮中,随木聚糖酶添加水平升高,p H下降(P<0.01,P<0.05),DMR有升高趋势。因此,在2个水分的稻草青贮中,添加木聚糖酶能够显著改善青贮效果,均以XYL3的添加效果最佳。

This study aimed to prove the effects of different xylanase addition levels on quality of rice strawsilage. Three treatment groups added with 20, 40, 80 mg/kg of xylanase respectively and a compared groupwere set up with conventional and low moisture of rice straw silage. They were named XYL1, XYL2, XYL3 andCON. Each treatment was repeated 3 times. The materials were ensiled for 60 days and opened. Thefermentation quality and the chemical composition were analyzed. Compared with conventional silages, DMR（Recovery rate of dry matter）, p H of low moisture silages significantly increased（P〈0.01）. In the conventionalensilaging, WSC（water soluble carbohydrate） and DMR increased by adding xylanase（P〈0.01, P〈0.05）. Inthe low moisture ensilaging, as the content of xylanase increased, the p H value was decreasing（P〈0.01, P〈0.05）, DMR had a rising trend. Therefore, in the two moisture contents of rice straw silage, adding xylanase cansignificantly improve the effect of silage. The effects of XYL3 group in both conventional and low moistureensilaging were the best.