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首页> 外文会议>International Symposium on the Nutrition of Herbivores(ISNH-7); 20070917-22; Beijing(CN) >Difference of nitrogen contents determined by the combustion and Kjeldahl method in response to nitrate nitrogen in some feedstuffs
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Difference of nitrogen contents determined by the combustion and Kjeldahl method in response to nitrate nitrogen in some feedstuffs

机译：燃烧法和凯氏定氮法测定某些饲料中氮含量对硝酸盐氮响应的差异

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摘要

Two experiments were conducted to examine the difference of nitrogen contents determined by the combustion (Cm) and Kjeldahl (Km) method and its response to nitrate nitrogen in ruminant feedstuffs. In Experiment 1,14 ruminant feedstuffs were determined for combustion nitrogen (Cn), Kjeldahl nitrogen (Kn) and nitrate nitrogen (NO3-N). Although NO3-N resulted in a difference between the Cm and Km, the correlation coefficient of the NO3-N content and the value of "Cn-Kn" was low (R2= 0.6341), suggesting other factors influencing the difference of N determination between the Cm and Km. In Experiment 2, recoveries of net NO3-N were determined using Chinese wild rye-grass (CWG), maize grain (MG) and soyabean meal (SBM) supplemented with sodium nitrate at the level of 5,10,15,20,25,30, 35,40 and 45% on DM basis, respectively. The results showed that different recoveries of NO3-N by Km rather than Cm would account for the difference of Cn and Kn in some ruminant feedstuffs.
机译：进行了两个实验，以研究通过燃烧（Cm）和凯氏定氮法（Km）确定的氮含量差异及其对反刍动物饲料中硝酸盐氮的响应。在实验1,14中，确定了燃烧氮（Cn），凯氏氮（Kn）和硝酸盐氮（NO3-N）的反刍动物饲料。尽管NO3-N导致Cm和Km之间存在差异，但NO3-N含量与“ Cn-Kn”值的相关系数较低（R2 = 0.6341），这表明其他影响氮测定之间差异的因素厘米和公里在实验2中，使用添加了5、10、15、20、25的硝酸钠的中国野生黑麦草（CWG），玉米籽粒（MG）和大豆粉（SBM）确定了净NO3-N的回收率。 ，DM，DM分别为30、35、40和45％。结果表明，某些反刍动物饲料中，Kn而不是Cm对NO3-N的回收率不同。

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