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饲粮瘤胃降解蛋白质水平对哈萨克育肥羊瘤胃微生物氮合成量和氮沉积量的影响

DOI: 10.3969/j.issn.1006-267x.2015.01.033

Keywords: 嘌呤衍生物,微生物氮,瘤胃降解蛋白质,氮沉积,哈萨克羊

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Abstract:

本试验旨在研究哈萨克羊育肥羊在以低质粗饲料条件下,增加饲粮瘤胃降解蛋白质(RDP)水平对瘤胃微生物氮(MN)合成量和氮沉积量的影响。选取体重为(30.0±2.8)kg的哈萨克羊育肥羊公羔3只作为试验动物,分别饲喂RDP水平为7.94%(TMR1)、9.02%(TMR2)、10.10%(TMR3)的3种饲粮。按照3×3拉丁方试验设计进行试验,共3期,每期预试期10d,正试期5d。全部收集粪尿,测定尿中嘌呤衍生物(PD)排出量、瘤胃MN合成量和转化效率。结果表明:3种饲粮的干物质及有机物的采食量及表观消化率均无显著性差异(P>0.05),但TMR3的氮沉积量、尿中PD排出量及瘤胃MN的合成量均显著高于TMR1和TMR2(P<0.05)。饲粮RDP水平与MN合成量/瘤胃表观可消化有机物(RADOM)采食量之间存在显著的正相关(R2=0.9994,P=0.0109)。MCP的转化效率不受饲粮RDP水平影响(P>0.05)。结果提示,低质粗饲料条件下,将饲粮RDP水平由7.94%提高至10.10%,能够提高哈萨克育肥羊氮沉积量,促进瘤胃MCP的合成,但未能显著提高MCP的转化效率。

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