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饲粮能氮瘤胃释放同步化对泌乳奶牛瘤胃发酵、生产性能及氮平衡的影响

DOI: 10.3969/j.issn.1006-267x.2011.09.008

Keywords: 能氮同步化,泌乳奶牛,瘤胃发酵,生产性能,氮平衡

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Abstract:

本试验旨在研究饲粮瘤胃能氮释放同步化对泌乳奶牛瘤胃发酵、生产性能及氮平衡的影响。试验采用4×4的拉丁方试验设计,试验动物为4头安装永久性瘤胃瘘管的泌乳中期荷斯坦奶牛,试验处理为4种瘤胃能氮释放同步化指数(SI)不同的等能、等氮饲粮(饲粮Ⅰ,SI=0.95;饲粮Ⅱ,SI=0.90;饲粮Ⅲ,SI=0.83;饲粮Ⅳ,SI=0.77)。每期试验19d,其中预试期14d,采样期5d,采样期的最后2d测定氮平衡。试验结果表明:1)瘤胃液pH随饲粮SI值的升高而降低(P<0.05);乙酸、丙酸、丁酸及总挥发性脂肪酸浓度,氨氮浓度,瘤胃液相体积、稀释速率以及菌体氮外流量各处理间差异不显著(P>0.05)。2)产奶量、乳蛋白及乳糖产量随着饲粮SI值的升高而增加(P<0.05);乳脂、乳糖、乳蛋白、乳尿素氮含量等各处理间差异不显著(P>0.05)。3)随着饲粮SI值的升高,乳氮、粪氮排出量升高(P<0.05),尿氮排出量减少,但各处理间差异不显著(P>0.05);SI值对饲粮氮表观消化率、饲粮氮泌乳转化效率无显著影响(P>0.05)。结果显示,提高饲粮能氮瘤胃释放同步化程度具有促进菌体蛋白合成,提高乳蛋白产量的效果。

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