化学和生物学处理对玉米秸秆营养价值的影响

分别使用尿素、氨和纷纷素酶等处理于玉米秸，测定了处理前后化学成分变化，并用尼龙袋法测定了秸秆干物质的瘤胃分解特性。表明：与未处理比较，尿素处理组组蛋白质含量显著提高，尿素添加量对其无影响，但贮存15d粗蛋白含量较低；氨处理组（添加3．0％氨）的粗蛋白质含量最高，处理时间无显著差异。酰性洗涤木质素含量氨处理组添加1．5％和3．0％比未处理有下降的趋势（P＜0．05）。干物质的瘤胃内的最大分解率（a b)随添加量提高有增大趋势，但尿素处理组贮存15d有下降趋势；氨处理组贮存期间不见显著值差别，但3．0％氨添加量有升高趋势。纤维素酶在添加和贮藏期间都无显著变化。作为玉米秸秆的营养价值的改善方法，尿素处理（2．65％）30d常温贮存，氨处理（3．0％）15d贮存较为合适。

Effect of Chemical and Biological Treatments on Nutritional Value of Corn Stover

Corn stover was treated with urea, ammonia and cellulase Chemical composition of corn stover before and after treatments was analyzed Degradability of dry matter in the rumen was determined using nylon bag technique The maize stalk was stored for 15*!days, 30*!days, 60 days The results indicated that crude protein (CP) content of stalk treated with urea was significantly increased However, no difference was found among the different amount of urea used The CP content of stalk treated with 3 0% ammonia was highest No difference was found among different treating times The contents of acid detergent lignin (ADL) of ammonia treatment with 1.5% and 3 0% urea had decreased extent comparing with control group ( P <0 05). Acid detergent fiber (ADF) contents did not differ among treatments The maximum degradable rate (a+b) of DM was slightly increased with increased amount of chemicals used There was no effect of cellulase on nutritional value of stalk In order to improve nutritional value, maize stalk is treated with 2 65% urea and stored for 30 days or with 3 0% of ammonia and stored for 15 days were considered to be suitable methods