Four experimental diets containing 75, 65 (standard), 55 and 45% TDN (total digestible nutrients) were fed White Leghorn growing pullets (10-20 weeks of age). Protein level was about 15% in all the experimental diets. After 20 weeks old, the conventional laying ration was fed all the pullets.The results were as follows.1. Body weight gain during 10-20 weeks of age decreased as the TDN level decreased. Body weight gain of the pullets fed TDN 45% ration was 61% of that fed TDN 65% ration. As dietary TDN level increased, feed consumption and feed efficiency decreased, and nitrogen retention increased.2. Sexual maturity of pullets fed lowest energy diet (TDN 45%) delayed about 10 days compared with pullets fed control diet, but subsequent laying performance was not affected by the dietary energy levels during growing period.3. It was shown that the feeding of low energy ration to the growing chickens (10-20 weeks of age) significantly restricted the growth, but did not improve egg production and other laying performance. Also, the pullets fed lower energy ration consumed much feed and decreased feed efficiency, and increased feed cost.