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饲粮不同采食水平下肉羊氮沉积和尿中嘌呤衍生物排出规律的研究

DOI: 10.3969/j.issn.1006-267x.2012.07.007

Keywords: 肉羊,可消化有机物采食量,尿嘌呤衍生物,嘌呤氮指数,微生物氮

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Abstract:

本试验旨在研究饲粮不同采食水平下肉羊氮沉积和尿中嘌呤衍生物(PD)的排出规律。试验选用12只平均体重为(41.3±2.8)kg的杜寒杂交绵羊公羔,随机平均分为3组,按照自由采食、自由采食量的70%和自由采食量的40%3个干物质采食水平饲喂,试验期为12d,其中预试期7d,正试期5d。结果表明:随着饲粮采食水平的降低,营养物质消化率均显著上升(P<0.05),粪氮和尿氮排出量均显著降低(P<0.05),沉积氮与摄入氮之间存在线性相关(R2=0.92)。尿中PD排出量和微生物氮(MN)产量均随采食水平的降低而显著降低(P<0.05),嘌呤氮指数(PNI)与氮沉积率和氮吸收率均表现出相同变化趋势。由此可见,PD排出量与可消化有机物采食量(DOMI)以及MN产量之间均存在线性相关,相关方程分别为Y=21.41X-1.81(R2=0.94)和Y=0.91X+2.57(R2=0.94);PNI能够将氮平衡和PD排出量有机结合起来,用于评价饲粮氮的利用效率。

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