玉米秸秆中性洗涤纤维与尿素间的组合效应

【目的】利用体外产气法研究玉米秸秆NDF与尿素不同组合体外发酵特性及组合效应。【方法】以玉米秸秆NDF与尿素为发酵底物,按5.2∶1、6.9∶1、8.6∶1、10.3∶1和12.1∶1不同比例进行组合,利用体外产气法记录不同组合在0、2、4、6、8、12、24、36、48、72和96 h时间点的体外产气量,并测定发酵液NH3-N浓度和挥发性脂肪酸含量。【结果】玉米秸秆中性洗涤纤维(NDF)与尿素所有组合时均产生正的组合效应,且组合效应随着发酵时间的延长而减弱。【结论】NDF与尿素最大正组合效应均发生在12.1∶1,整个发酵时间内,NDF/尿素分别为6.9∶1、8.6∶1和12.1∶1正组合效应显著(P<0.05)。

Study on Associative Effects Between Urea and Neutral Detergent Fiber Extracted from Corn Straw

【Object and Method】The study was conducted by using in vitro gas production technique to investigate the fermentation characteristics of a compound neutral detergent fiber(corn straw) and urea.A series of mixtures of NDF and urea were incubated using in vitro gas production technique.The ratio(NDF/Urea) in the mixtures were 5.2∶ 1,6.9∶ 1,8.6∶ 1,10.3∶ 1 and 12.1∶ 1 respectively.The gas production was recorded at 0,2,4,6,8,12,24,36,48,72 and 96 h.The NH3-N and volatile fat acid(VFA) were determined.【Result】The positive effects were all observed between NDF and urea and were reduced with the incubation time.【Conclusion】When NDF mixed with urea at the proportion of 12.1,the maximal positive associative effect was produced.The proportion of NDF to urea are 6.9∶ 1,8.6∶ 1 and 12.1∶ 1 respectively,which were different significantly(P<0.05).