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桑叶黄酮和白藜芦醇对肉羊气体代谢及甲烷排放的影响

DOI: 10.3969/j.issn.1006-267x.2014.05.012

Keywords: 桑叶黄酮,白藜芦醇,肉羊,气体代谢,甲烷

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Abstract:

本试验旨在研究天然植物提取物桑叶黄酮(MLF)和白藜芦醇(Res)对肉羊气体代谢及甲烷排放的影响,并筛选出它们的最适宜的添加水平。选取15只体重为(60.00±1.73)kg、年龄相近、体况良好的杜泊绵羊(♂)×小尾寒羊(♀)杂交F1代肉用成年母羊作为试验动物。试验采用单因素试验设计,包括对照期以及试验期Ⅰ和Ⅱ。对照期:15只羊均饲喂基础饲粮(0添加水平,对照组,n=15);试验期Ⅰ:将15只羊随机分为5组(n=3),MLF添加水平分别为0.25、0.50、1.00、2.00和4.00g/d;试验期Ⅱ:将15只羊随机分为5组(n=3),Res添加水平分别为0.125、0.250、0.500、1.000和2.000g/d。每期试验16d,其中预试期7d,正试期9d。采用Sable开路式循环测热系统进行气体代谢试验。结果表明:与对照组相比,MLF添加水平为2.00g/d时,代谢体重基础上每千克干物质采食量的甲烷排放量降幅最大,但差异不显著(P>0.05),Res添加水平为0.250g/d时,显著降低了代谢体重基础上每千克干物质采食量的甲烷排放量(P<0.05),降幅分别为6.38%、10.11%。结果提示,天然植物提取物MLF和Res可以在一定程度上影响肉羊的气体代谢并降低甲烷排放量;本试验条件下,MLF和Res抑制甲烷排放效果最佳的添加水平分别为2.00、0.250g/d。

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