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不同地域玉米秸化学成分、瘤胃发酵特性和能量价值比较

DOI: 10.3969/j.issn.1006-267x.2014.02.027

Keywords: 地域来源,玉米秸,化学成分,瘤胃发酵特性,产气量,能量价值

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Abstract:

本试验旨在以采自北京大兴(BJ)、河北文安(HB)、吉林公主岭(JL)、山西太原(SX)、江苏徐州(JS)5个地域的同一品种玉米秸作为试验材料,通过化学分析和体外人工瘤胃产气法比较其化学成分、瘤胃发酵特性及能量价值的差异。采用单因素完全随机化试验设计。结果表明:不同地域来源玉米秸的粗蛋白质、粗脂肪和粗灰分含量最高的玉米秸分别高出含量最低的49.0%(P<0.05)、51.5%(P<0.05)和52.3%(P<0.01);体外发酵的玉米秸24和72h净产气量和产气速度c以来源于BJ的玉米秸最高(P<0.01),SX最低(P<0.01),其余各组居于其间;与其他地域来源的玉米秸相比,BJ玉米秸体外发酵的pH(P<0.05)、氨态氮浓度最低(P<0.01),但丙酸摩尔比例最高(P<0.05或P>0.05);不同地域的玉米秸体外有机物消化率、总可消化养分含量、消化能、代谢能和增重净能值最高值较最低值分别高出20.1%、13.6%、13.7%、13.6%和43.2%(P<0.01)。由本试验可知,不同地域来源的玉米秸在化学成分、体外瘤胃发酵参数(除乙酸和异丁酸摩尔比例外)、产气量、有机物消化率含量和能量价值方面存在显著差异,在采用玉米秸作为肉牛粗饲料时,应对其化学成分和能量价值进行实际测定或估测。

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