利用体外产气法评价微贮小麦秸秆营养价值的研究

Evaluation on the Nutritive Value of Wheat Straw Silage Using Gas Production Technique in vitro

[目的]提高青海省小麦秸秆的利用率。[方法]采用小麦秸秆为原料进行微贮,测定不同微贮时间小麦秸秆的pH、粗蛋白(CP)、粗纤维(CF)、粗脂肪(EE)、水分(H2O)含量,研究微贮时间对小麦秸秆品质的影响,并利用体外产气技术对其进行评价。[结果]各试验组pH随微贮时间的增加逐渐减小,均极显著低于对照组(P<0.01)。试验组CP随微贮时间的增加而升高,均高于对照组。试验组CF含量随微贮时间增加而降低,均极显著低于对照组(P<0.01)。试验组EE含量随微贮时间呈逐渐递增的趋势,均高于对照组,但与对照组差异不显著(P>0.05)。试验组水分含量随微贮时间增加而降低。随微贮时间的增加,净产气量逐渐上升、干物质降解率(DM)和有机物质降解率(OMD)、消化能(DE)和代谢能(ME)逐渐升高。[结论]综合考虑,小麦秸秆微贮22 d即可满足生产需求。

[ Objective ] The research aimed to increase the utilization ratio of wheat straw in Qinghai Province. [ Method ] Wheat straw was used as materials for silage, pH ,the contents of crude protein （CP）, crude fiber（ CF ）, ether extract （EE）and water in wheat straw at different silage time were determined. The effects of silage time on the quality of wheat straw were studied and its was evaluated by using gas production technique in vitro. [ Result ] pH in each test group gradually decreased with the silage time, which was all significantly lower than that in control group （P 〈 0.01 ）. CP content in all test groups increased with the silage time, which was all higher than that in control group. CF content in all test groups decreased with the silage time ,which was all significantly lower than that in control group（P 〈0.01 ）. EE content in all test groups showed gradual increase trend with the silage time, which was all higher than that in control group, without significant difference with control group （P 〉 0.05 ）. Water content in test groups decreased with the silage time. With the silage time, net gas production gradually increased, dry matter degradability, organic matter degradability, digestible energy and metabolizable energy gradually increased. [ Conclusion] Comprehensively considered, silaging wheat straw for 22 d could meet the production demands.