Freeman C P
Br Poult Sci. 1979 Jan;20(1):27-37. doi: 10.1080/00071667908416546.
The "available" tryptophan requirements of male and female broiler chicks were determined at 7-d intervals from 0 to 56 d, using a diet-dilution technique. Availability of tryptophan in the diets was estimated by growth assay with chicks. 2. The tryptophan requirements were 2.4 (males) and 2.2 g/kg of diet (female) from 0-7 d, and 1.7 g/kg (males and females) from 7-35 and 35-56 d. The absolute requirement of the chick for tryptophan increased with age and was significantly different for male and female birds. 3. A highly significantly predictive equation relating tryptophan requirement to mean body weight and gain was established.
采用日粮稀释技术，每隔7天测定0至56日龄雄性和雌性肉仔鸡的“可利用”色氨酸需求量。通过雏鸡生长试验评估日粮中色氨酸的可利用性。2. 0至7日龄时，色氨酸需求量为2.4（雄性）和2.2克/千克日粮（雌性），7至35日龄以及35至56日龄时为1.7克/千克（雄性和雌性）。雏鸡对色氨酸的绝对需求量随年龄增长而增加，且雄性和雌性鸡有显著差异。3. 建立了一个将色氨酸需求量与平均体重和增重高度显著相关的预测方程。
