不同水平复合酶对稻草青贮品质的影响

Effects of Different levels of Enzyme Mixture on Quality of Rice Straw Silage

本试验旨在研究不同水平复合酶(含有纤维素酶和木聚糖酶)对稻草青贮品质的影响。在常规水分稻草青贮(MC1)和低水分稻草青贮(MC2)中分别添加0(对照组)、25、50、100mg/kg复合酶,每个处理组3个重复。常温下贮存60d开封。结果表明,MC2青贮中pH、干物质回收率和可溶性碳水化合物含量均极显著高于MC1青贮(P<0.01),而乳酸和氨态氮含量均极显著低于MC1青贮(P<0.01);与对照组相比,MC1青贮中各组氨态氮、中性洗涤纤维含量分别极显著(P<0.01)和显著(P<0.05)减少,MC2青贮中各组pH均极显著降低(P<0.01),MC1和MC2青贮中100mg/kg组干物质回收率、氨态氮含量分别极显著升高和降低(P<0.01)、可溶性碳水化合物显著增加(P<0.05)。提示,添加3个复合酶水平对稻草青贮品质都有显著效果,MC2青贮中以添加100mg/kg复合酶效果最佳。

This trial aimed to study the effects of different levels of enzyme mixture （containing cellulose and xylanase） on quality of rice straw silage. Conventional moisture ensilaging （MC1） and low moisture ensilaging （MC2） were added 0（control group） ,25,50,100 mg/kg enzyme mixture, respectively. Each treatment was repeated 3 times. The materials were ensiled at room temperature and opened 60 days later. The results showed that pH,dry matter recovery and water soluble carbohydrate content in MC2 were extremely significantly higher than that in MC1 （P〈0.01）. The contents of lactic acid and ammonia nitrogen in MC2 were extremely significantly lower thaa that in MC1 （P〈0.01）. Compared with the control group,the contents of ammonia nitrogen （P〈0.01） and neutral detergent fiber （P〈0.05） in all the treatments of MC1 had significantly decreased. The pH in all the treatments of MC2 had extremely significantly decreased （P〈0.01） ,the dry matter recovery and ammonia nitrogen content in 100 mg/kg group of MC1 and MC2 had extremely significantly increased and decreased （P〈0.01）, respec tively, the water soluble carbohydrate content in 100 mg/kg group of MC1 and MC2 had significantly increased （P〈0.05）. The results indicated that enzyme mixture could improve the quality of both MC1 and MC2,the best level was 100 mg/kg in MC2.