本试验在实测饲粮玉米和豆粕净能(NE)值的基础上，研究1~21日龄艾维茵肉鸡净能需要量。选用1日龄的艾维茵肉公鸡250只，随机分为5组，每组5个重复，每个重复10只鸡，饲粮净能水平分别为8.97、9.25、9.54、9.83、10.11 MJ/kg，考察不同净能水平对1~21日龄艾维茵肉鸡生长性能和氮代谢的影响。结果表明：9.83 MJ/kg净能水平组平均日增重（ADG）和料重比(F/G)最佳，极显著优于8.97和9.25 MJ/kg净能水平组（P＜0.01），显著优于9.54 MJ/kg净能水平组（P＜0.05），但和10.11 MJ/kg净能水平组差异不显著（P>0.05）。氮利用率以9.83 MJ/kg 净能水平组显著高于其他各组（P＜0.01）。分别以ADG和F/G进行回归分析得出，1~21日龄艾维茵肉鸡净能需要量分别为9.88和9.90 MJ/kg，平均值为9.89 MJ/kg。由此可知，在本试验条件下，1~21日龄艾维茵肉鸡净能需要量为9.89 MJ/kg。

The experiment was conduced to study the net energy (NE) requirement of Avian broilers aged from 1 to 21 days based on the measured NE of dietary corn and soybean meal. Two hundred and fifty one-day-old Avian broilers were randomly divided into 5 groups with 5 replicates of 10 broilers in each replicate, with the NE levels of the diets as 8.97, 9.25, 9.54, 9.83 and 10.11 MJ/kg, respectively, to investigate the effect of NE levels on the performance and nitrogen metabolism of Avian broilers aged from 1 to 21 days. The results showed as follows: the ADG and F/G in 9.83 MJ/kg NE group had extremely significant difference with 8.97 and 9.25 MJ/kg NE groups (P＜0.01), and had significant difference with 9.54 MJ/kg NE group (P<0.05), but had no difference with 10.11 MJ/kg NE group (P>0.05). The nitrogen availability in 9.83 MJ/kg NE group was significantly higher than that in other groups (P＜0.01). According to the regression analysis based on ADG and F/G, the NE requirement of Avian broilers aged from 1 to 21 days was 9.88 and 9.90 MJ/kg, respectively, and the average value was 9.89 MJ/kg. In conclusion, the net energy requirement of Avian broiler aged from 1 to 21 days is 9.89 MJ/kg.［Chinese Journal of Animal Nutrition，2011，23（1）：147-153］