The relationship between microbial N synthesis and urinary excretion of purine derivatives in Dorper x thin-tailed Han crossbred sheep

文献类型： 外文期刊

第一作者： Ma, Tao

作者： Ma, Tao;Jiang, Chenggang;Tu, Yan;Zhang, Naifeng;Liu, Jie;Zhao, Yiguang;Diao, Qiyu;Deng, Kaidong

作者机构：

关键词： N-15;Purine bases;Purine derivatives;Microbial N yield

期刊名称：SMALL RUMINANT RESEARCH （ 影响因子：1.611； 五年影响因子：1.813 ）

ISSN： 0921-4488

年卷期： 2013 年 112 卷 1-3 期

页码：

收录情况： SCI

摘要： This study aimed to investigate the relationship between microbial N (MN) yield and urinary excretion of purine derivatives (PD) from the rumen in Dorper x thin-tailed Han crossbred sheep. Twelve Dorper x thin-tailed Han crossbred, non-castrated male lambs (41.3 +/- 2.8 kg body weight) fitted with ruminal and duodenal cannulae were randomly assigned to one of three levels of DM intake: ad libitum intake, 70%, or 50% of the ad libitum intake, with four lambs at each level. The MN yield from the rumen was measured using N-15 or purine bases (PB) as a microbial marker, and urinary PD were determined by colorimetric methods. Microbial components (OM, N, PB and ratio of PB to N) were not affected (P > 0.05) by dietary treatment. The MN yield measured using PB was slightly lesser and more variable than using N-15. No difference in MN yield was found between markers. The efficiency of MN synthesis (g N/kg organic matter apparently digested in the rumen) was not affected (P > 0.05) by feed intake regardless of the marker used. Urinary PD decreased significantly (P < 0.05) with decreasing level of feed intake and the molar recovery of duodenal PB measured with digesta markers as urinary PD was 0.83 (r(2) = 0.89, P < 0.001). Urinary PD excretion was linearly correlated with DOMI (r(2) = 0.94, P < 0.001), and MN yield estimated by using either N-15 or PB (r(2) = 0.91 and 0.80, respectively, P < 0.001). These results suggest that urinary PD excretion is an accurate indicator of MN synthesized in the rumen, and an equation, MN (g/d) = 0.030 + 0.741 x PD (mmol/d), is proposed to predict the MN yield from the rumen of Chinese sheep. (c) 2012 Elsevier B.V. All rights reserved.

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