本试验旨在研究氨化对油菜秸秆营养成分及山羊瘤胃降解特性的影响。将粉碎的油菜秸秆用30%水和不同比例(10%、15%、20%)碳酸氢铵进行氨化处理,并于处理后7、14和21 d采集样品,与未氨化处理的油菜秸秆(对照)同时进行营养成分分析。然后采用尼龙袋法测定氨化和未氨化处理油菜秸秆的干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的瘤胃降解率。结果表明:氨化后油菜秸秆CP含量增加,粗脂肪(EE)、NDF和ADF含量下降,DM、粗灰分含量基本保持不变。氨化组油菜秸秆DM和CP有效降解率均显著高于对照组(P<0.05);15%、20%碳酸氢铵氨化处理油菜秸秆ADF有效降解率均显著高于对照组(P<0.05)。综合得出,添加15%和20%碳酸氢铵氨化能显著提高油菜秸秆DM、CP和ADF的山羊瘤胃降解率,油菜秸秆经15%碳酸氢铵、30%水分条件下氨化处理效果最好、最经济。

This study was conducted to investigate the effects of ammonification of rape straw on nutrient composition and rumen degradation characteristics in goats. Crushed rape straw was ammonified using 30% water and different percentages (10%, 15% and 20%) of ammonium bicarbonate for 7, 14 and 21 d, respectively. The samples of ammonified and un-ammonified rape straw (control) were collected to measure nutrient composition, and rumen degradation rates of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) were also determined using nylon-bag technique. The results showed as follows: after ammonification, CP content in rape straw was increased, ether extract, NDF, ADF contents were decreased, and DM and ash contents remained unchanged. The effective degradability of DM and CP of ammonification groups were significantly higher than those of control group (P<0.05); the effective degradability of ADF in 15% and 20% ammonification groups was significantly higher than that of control group (P<0.05). In conclusion, ammonfication with 15% and 20% ammonium bicarbonate can significantly increase the effective degradability of DM, CP and ADF of rape straw in goats, and 15% ammonium bicarbonate with 30% water supplement is the best and the most economical condition.