Okumura J, Mori S, Muramatsu T
Br Poult Sci. 1985 Oct;26(4):519-25. doi: 10.1080/00071668508416843.
The effect of different amounts of food, varying from below to above the rate of voluntary intake, was studied in chicks using a standard diet and diets containing only half the recommendation concentrations of leucine, isoleucine or valine. Irrespective of diet the body weight gain of the chicks increased with increasing food consumption. The body weight gain of chicks given the leucine-deficient diet was similar to that of chicks given the same amount of the standard diet. In contrast, the body weight gains of chicks given either the valine- or isoleucine-deficient diet were significantly less than that of chicks given the same amount of the standard diet. When the food intakes of the birds were similar the differences in body protein and water contents of the birds fed the different diets reflected differences in body weight gains, whereas body fat content was affected in the reverse manner. Retention and retention rate of dietary energy increased as food consumption increased. This was particularly evident in chicks given the isoleucine-deficient diet, followed by those given the valine-, leucine-deficient and standard diets. For all diets, the amounts of nitrogen retained and nitrogen retention rate (N retained/N consumed) increased in line with body weight gain. The metabolisable energy values of the diets were similar, except for the isoleucine-deficient diet which had a significantly higher metabolisable energy value than the standard valine-deficient diets.
使用标准日粮以及仅含亮氨酸、异亮氨酸或缬氨酸推荐浓度一半的日粮，对雏鸡进行研究，观察从低于到高于自愿摄入量的不同食物量的影响。无论日粮如何，雏鸡的体重增加都随着食物摄入量的增加而增加。给予亮氨酸缺乏日粮的雏鸡体重增加与给予相同量标准日粮的雏鸡相似。相比之下，给予缬氨酸或异亮氨酸缺乏日粮的雏鸡体重增加显著低于给予相同量标准日粮的雏鸡。当鸡的采食量相似时，饲喂不同日粮的鸡体蛋白质和水分含量的差异反映了体重增加的差异，而体脂肪含量的影响则相反。随着食物摄入量的增加，日粮能量的保留量和保留率增加。这在给予异亮氨酸缺乏日粮的雏鸡中尤为明显，其次是给予缬氨酸、亮氨酸缺乏日粮和标准日粮的雏鸡。对于所有日粮，氮保留量和氮保留率（保留氮/摄入氮）均随体重增加而增加。日粮的代谢能值相似，但异亮氨酸缺乏日粮的代谢能值显著高于标准缬氨酸缺乏日粮。
