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草业学报  2010 

红豆草缩合单宁对绵羊瘤胃代谢及饲粮尼龙袋降解率的影响

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Keywords: 红豆草,缩合单宁,瘤胃代谢,尼龙袋降解率,挥发性脂肪酸,绵羊,纤维素分解微生物

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Abstract:

选用3只1岁半、平均体重24kg,安装永久瘤胃瘘管的甘肃高山细毛羊羯羊,按3×3拉丁方试验设计,每个循环19d(预试期10d,正试期9d),研究饲粮中红豆草缩合单宁水平对绵羊瘤胃代谢的影响。试验共设3个处理饲粮,其中红豆草缩合单宁水平依次是Ⅰ为0.00g/kgDM、Ⅱ为1.52g/kgDM、Ⅲ为3.03g/kgDM。试验结果表明,3个处理的瘤胃液pH均值(依组次为6.24±0.32,6.13±0.28和6.13±0.37)无显著差异(P>0.05);处理Ⅱ、Ⅲ瘤胃液总挥发性脂肪酸(TVFA)呈高于Ⅰ的趋势(P=0.099);处理Ⅲ的乙酸摩尔比低于处理Ⅰ(P<0.05)与Ⅱ(P=0.074),其丙酸摩尔比较高(P=0.088),乙酸/丙酸较低(P=0.096);各处理间瘤胃液总氮、蛋白氮、细菌氮、氨态氮、尿素氮的平均浓度差异均不显著(P>0.05)。因此,本试验结果表明,含红豆草缩合单宁3.03g/kgDM的饲粮对绵羊瘤胃纤维素分解微生物的活性产生一定程度的抑制,而分解淀粉的微生物活性被增强。

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