The experiment was conduced to study the net energy ( NE) requirement of Avian broilers aged from l to 21 days based on the measured NE of dietary corn and soybean meal. Two hundred and fifty oneday-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 ]%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.
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