体外法评价汽爆处理对常见秸秆饲料品质的影响

为评估汽爆作为秸秆饲料化处理技术的可行性,通过常规化学分析、体外产气量法以及模型预测等方法综合评价3种常见秸秆的汽爆处理效果。结果显示:汽爆处理后,秸秆的干物质和灰分的比例显著升高(P0.05),同时中性洗涤纤维的比例显著降低(P0.01);不同种类秸秆的蛋白质、酸性洗涤纤维和木质素的比例变化不一致。汽爆处理消除(P0.01)了秸秆体外发酵的延滞期(lag),提高(P0.01)了产气速率(c),降低(P0.01)了理论最大产气量(B);汽爆处理对玉米秸和稻秸发酵产气的提升作用比小麦秸的效果好。汽爆处理显著提高(P0.01)秸秆的粗饲料相对值(%)和干物质采食量(%,BW)。以上结果表明,汽爆处理使秸秆理化特性发生很大变化,粗饲料品质显著提高。

In vitro method to evaluate the effect of steam explosion on the quality of common straw feed

To estimate the feasibility of applying steam explosion as the processing technique of fibrous feedstuff,chemical analysis,in vitro gas production and model prediction were adopted to evaluate the effects of steam explosion.The results showed that:Steam explosion increased(P<0.05) the dry matter and ash of the straw,while decreased(P<0.01) the content of neutral detergent fiber (NDF);The changes of crude protein,acid detergent fiber (ADF) and lignin (ADL) among the three straw were inconsistent;Steam explosion processing eliminated(P<0.01) the lag time of in vitro fermentation and increased(P<0.01) the rate of gas production (c),while decreased(P<0.01) the asymptotic gas production;Moreover,steam explosion exerted a better effect on the gas production of corn straw and rice straw than that of wheat straw.Consequently,the relative forage value(%) and dry matter intake (%,BW) of the straw were increased(P<0.01) with steam explosion.In conclusion,the physiochemical property of the straw was altered,substantially improved the quality of straw feed.