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过瘤胃蛋氨酸对奶牛瘤胃体外发酵及泌乳奶牛生产性能的影响

DOI: 10.3969/j.issn.1006-267x.2015.07.032

Keywords: 过瘤胃蛋氨酸,奶牛,粗蛋白质消化率,乳蛋白率

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Abstract:

本文主要研究过瘤胃蛋氨酸对奶牛瘤胃体外发酵及泌乳奶牛生产性能的影响。体外发酵试验:分别在培养液中添加蛋氨酸、过瘤胃蛋氨酸,以无添加为对照,在培养0、2、4、8、12、16和24h测定pH以及氨态氮、细菌蛋白和原虫蛋白含量;动物试验:选用30头健康的泌乳荷斯坦奶牛采用随机区组分为3组,分别在基础饲粮中添加13.50g/(头·d)蛋氨酸、30.00g/(头·d)过瘤胃蛋氨酸,以无添加为对照。预试期7d,正试期42d。结果表明:1)体外发酵试验,培养液pH、氨态氮和细菌蛋白含量在组间都没有显著差异(P>0.05);与对照组相比,过瘤胃蛋氨酸组和蛋氨酸组均显著提高了培养液原虫蛋白含量(P<0.05),但2个试验组间没有显著差异(P>0.05)。2)动物试验,第28天时,以及乳蛋白率和乳脂率在3组间都没有显著的差异(P>0.05)。第42天时,过瘤胃蛋氨酸组的乳蛋白率和乳脂率显著高于其他2组(P<0.05),而该组的血清尿素氮和乳尿素氮含量显著低于其他2组(P<0.05);另外,该组的饲粮粗蛋白质消化率也显著高于其他2组(P<0.05)。综上,过瘤胃蛋氨酸对奶牛瘤胃体外发酵没有显著影响,但可在一定程度上提高奶牛乳蛋白率和乳脂率和饲粮粗蛋白质的消化率。

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