Halle I, Jeroch H, Gebhardt G
Arch Tierernahr. 1984 Dec;34(12):833-40. doi: 10.1080/17450398409425738.
After N-balance experiments with broiler hens in the top laying period and the feeding of soybean coarse meal/fish meal protein the protein utilisation values were calculated. The PNu curve and the PEW curve could be described as utilisation values from the N-retention curve (e-function). At an intake of N at which the hen neither decomposed nor retained protein, the utilisation (PNu) for maintenance and egg production was 55.3% and the utilisation of feed protein for egg production 49.4%. Maximum PEW 34.3% could only be ascertained at an N-intake/LW0.67kg of 1500 mg. The corresponding crude protein quota of 18.7 g recommended as crude protein requirement is calculated from this N-quota (xm) and a live weight of the broiler hen of 2804 g. For the same N-quota (xm) and the same live weight of the hens this results in a necessary quota of S-AA of 694 mg per hen and day. Provided the daily feed intake is 145 g and thus the intake of crude protein 18.7 g and that of S-AA 694 mg per hen, the necessary crude protein content of the feed is 130 g per kg original substance and an S-AA concentration which is equivalent to 3.7% of the crude protein (in g/16 g N).
在对处于产蛋高峰期的蛋鸡进行氮平衡实验并饲喂大豆粗粉/鱼粉蛋白后，计算了蛋白质利用率值。PNu曲线和PEW曲线可以描述为氮保留曲线（e函数）的利用率值。在蛋鸡既不分解也不保留蛋白质的氮摄入量下，维持和产蛋的利用率（PNu）为55.3%，饲料蛋白质用于产蛋的利用率为49.4%。只有在氮摄入量/LW0.67kg为1500mg时才能确定最大PEW为34.3%。根据该氮配额（xm）和2804g蛋鸡的活重，计算出推荐的粗蛋白需求量为18.7g的相应粗蛋白配额。对于相同的氮配额（xm）和相同的母鸡活重，这导致每只母鸡每天所需的S-AA配额为694mg。假设每日采食量为145g，因此每只母鸡的粗蛋白摄入量为18.7g，S-AA摄入量为694mg，则饲料所需的粗蛋白含量为每千克原物质130g，S-AA浓度相当于粗蛋白的3.7%（以g/16g N计）。
