Pesti G M
Department of Poultry Science, University of Georgia, Athens 30602.
Poult Sci. 1991 Jan;70(1):103-14. doi: 10.3382/ps.0700103.
Two experiments were conducted with hens from 20 to 44 wk of age housed in cages. There were 384 hens in Experiment 1 and 360 hens in Experiment 2. The hens were fed various levels of protein and energy in a factorial arrangement in Experiment 1 and in a central composite rotatable design in Experiment 2. The diets contained primarily ground corn, soybean meal, wheat middlings, and poultry oil. Production responses to dietary protein and MEn were found to be nonlinear in nature and thus conformed to the law of diminishing marginal returns. Protein by MEn interactions, when significantly different from zero, were small in magnitude. Variability in hen performance (as measured by hen-day egg production, feed consumption, egg weight, and body weight gain) could be described better by using dietary protein and energy levels than the energy to protein ratio.
用20至44周龄的笼养母鸡进行了两项试验。试验1中有384只母鸡，试验2中有360只母鸡。在试验1中，母鸡被饲喂不同水平的蛋白质和能量，采用析因设计；在试验2中，采用中心复合旋转设计。日粮主要由玉米粉、豆粕、小麦麸和家禽油组成。发现日粮蛋白质和代谢能对生产性能的反应本质上是非线性的，因此符合边际收益递减规律。蛋白质与代谢能的交互作用，当显著不同于零时，幅度较小。用日粮蛋白质和能量水平比能量蛋白比能更好地描述母鸡生产性能的变异性（以母鸡日产蛋量、采食量、蛋重和体重增加衡量）。
