Halle I, Jeroch H
Bundesforschungsanstalt für Landwirtschaft Braunschweig-Völkenrode, Institut für Kleintierforschung Celle, Merbitz, Germany.
Arch Tierernahr. 1993;43(4):319-29. doi: 10.1080/17450399309386047.
After N-balance experiments with leghorn-hens of five different genetic origins in the top laying period, the advanced laying period as well as at the end of the laying period and with feeding of soybean meal/fish meal protein, the nitrogen maintenance requirement per live weight kg0.67 was ascertained regressively by approximation of the N-balance from N-increasing experiments to an exponential function. The Net Protein Utilization (PNu) curve and the apparent Net Protein Utilization (PEW) curve could be described as utilisation values from the N-retention curve (e-function). Moreover the relation between N-intake/LW kg0.67 and egg-N-discharge/LW kg0.67 from N-balance made it possible to estimate N-retention in the body. Finally, capability of the five origins at equal protein and S-AA intake respectively were compared.
在对处于产蛋高峰期、产蛋后期以及产蛋期末期的五个不同遗传来源的来亨鸡进行氮平衡实验，并饲喂豆粕/鱼粉蛋白后，通过将氮增加实验中的氮平衡近似为指数函数，逐步回归确定了每千克活重0.67的氮维持需求量。净蛋白质利用率（PNu）曲线和表观净蛋白质利用率（PEW）曲线可以描述为氮保留曲线（e函数）的利用率值。此外，氮平衡中氮摄入量/每千克活重0.67与蛋中氮排出量/每千克活重0.67之间的关系使得估计体内氮保留成为可能。最后，比较了五个来源在分别摄入等量蛋白质和硫氨基酸时的能力。
