Halle I, Jeroch H, Gebhardt G
Arch Tierernahr. 1984 Sep;34(9):615-21. doi: 10.1080/17450398409425711.
In the top laying period (29th/30th week of life) egg protein synthesis and protein retention in the bodies of laying hens were ascertained. Based on egg-N analyses, the relation between N-intake/live weight0.67kg and egg-N discharge/kg LW0.67kg was regressively calculated and described. The subtraction of egg-N discharge/LW0.67kg from N-balance/LW0.67kg made it possible to estimate N-retention/LW0.67kg in the body. From the intersection of this curve with the chi-axis it follows that the broiler hen meets the N-requirement for maintenance and egg production with a daily consumption of 1,264.7 mg N/LW0.67kg, which corresponds to 15.8 g crude protein, and then neither loses nor retains body protein. At a daily intake of this amount of CP (15.8 g) the broiler hen produces 44.1 g egg per day. An energy intake of more than 70 EFUhen/animal and day resulted in fat retention in the broiler hen.
在产蛋高峰期（29/30周龄），测定了蛋鸡体内的蛋蛋白质合成和蛋白质保留情况。基于蛋氮分析，对氮摄入量/活重0.67千克与蛋氮排出量/千克活重0.67千克之间的关系进行了回归计算和描述。用氮平衡/活重0.67千克减去蛋氮排出量/活重0.67千克，就可以估算出体内氮保留量/活重0.67千克。从这条曲线与χ轴的交点可以得出，肉种鸡每日消耗1264.7毫克氮/活重0.67千克（相当于15.8克粗蛋白）时，满足维持和产蛋的氮需求，此时既不损失也不保留体蛋白。当肉种鸡每日摄入该量的粗蛋白（15.8克）时，每天产蛋44.1克。能量摄入量超过70千卡代谢能/只鸡·天会导致肉种鸡脂肪蓄积。
