Herrmann U, Schneider R
Arch Tierernahr. 1983 Oct-Nov;33(10-11):749-59. doi: 10.1080/17450398309425159.
The influence of supplementing the ration with the limiting amino acid lysine on N-excretion in urine and the urea concentration in the blood (UCB) is investigated in an experiment with pregnant young sows. In contrast or the basic ration the most satisfactory N-utilisation reflects itself after a lysine intake of 8.2 g/animal and day during the early phase of gestation and 8.6 g during the last phase of gestation both in a diminished N-excretion in urine and a lower UCB. The following correlation coefficients were calculated for the relation between UCB an N-excretion in urine: early phase of gestation: 0.177 (n = 37); last phase of gestation. 0.431 (n = 30); gestation as a whole: 0.416 (n = 67). In a second experiment methionine supplementation in the feeding of a ration with a deficit of sulphur-containing amino acids led to a significant decrease of N-excretion in urine (alpha = 5%). While UCB also significantly decreased 5 hours after feeding, UCB virtually did not react to a changed level of amino acid intake when the blood sample was taken before feeding. In a third experiment, in which 49 g N/animal and day were taken in, differences regarding N-excretion in urine and UCB between pregnant and non-pregnant animals could not be established. When the results published in the first communication (Herrmann and Schneider, 1981) are included, the following correlation coefficients for the relation between N-excretion in urine and UCB are the result: 0.716 (n = 182) for sampling before feeding and 0.808 (n = 133) for sampling 5 hours after feeding. The confidence range of the estimated function y = -2.97 + 1.233 chi for the relation between N-excretion in urine (y; g/animal and day) and UCB 5 hours after feeding (chi; mg/100 ml serum) as well as the variability values do not make it possible to estimate N-excretion in urine from UCB with satisfactory accuracy.
在一项针对怀孕小母猪的实验中，研究了在日粮中添加限制性氨基酸赖氨酸对尿液中氮排泄量以及血液中尿素浓度（UCB）的影响。与基础日粮相比，在妊娠早期每头动物每天摄入8.2克赖氨酸以及在妊娠后期摄入8.6克赖氨酸时，氮利用率最为理想，这表现为尿液中氮排泄量减少以及UCB降低。针对UCB与尿液中氮排泄量之间的关系计算了以下相关系数：妊娠早期为0.177（n = 37）；妊娠后期为0.431（n = 30）；整个妊娠期为0.416（n = 67）。在第二项实验中，在含硫氨基酸缺乏的日粮中添加蛋氨酸导致尿液中氮排泄量显著降低（α = 5%）。虽然喂食后5小时UCB也显著降低，但在喂食前采集血样时，UCB对氨基酸摄入量的变化几乎没有反应。在第三项实验中，每头动物每天摄入49克氮，未发现怀孕动物与未怀孕动物在尿液中氮排泄量和UCB方面存在差异。当纳入第一篇通讯文章（赫尔曼和施奈德，1981年）中发表的结果时，得出了尿液中氮排泄量与UCB之间关系的以下相关系数：喂食前采样为0.716（n = 182），喂食后5小时采样为0.808（n = 133）。对于尿液中氮排泄量（y；克/动物·天）与喂食后5小时UCB（χ；毫克/100毫升血清）之间的关系，估计函数y = -2.97 + 1.233χ的置信区间以及变异性值使得无法从UCB以令人满意的准确度估计尿液中氮排泄量。
