This experiment was conducted to determine the optimum level of daily protein consumption for broiler breeder hens of 24 to 64 weeks of age on a control-fed basis with 700 hens of Hy-Bro strain. Seven levels of protein allotments were used to supply 16 to 28 grams of protein per day in 2 gram increments. A stepwise increase in energy levels was used and the diets supplied the following amounts of energy (ME ㎉/day) during these time periods regarding to age; 24-26 weeks, 320 ㎉; 26-28 weeks, 350 ㎉; 28-30 weeks, 380 ㎉; 30-32 weeks, 410 ㎉; 32-34 weeks, 430 ㎉; 3412 weeks, 410 ㎉; and after 42 weeks, 400 ㎉. Within each energy level, 7 diets were formulated to provide different daily protein. Thus there were 42 total diets formulated and fed during the course of experiment. The results obtained are summarized as follows: 1. No significant differences were observed in egg production rate during the periods of 24-3(I and 30-42 weeks of age. However, agg production rate during the period of 42-64 weeks of age was higher in hens fed 16 to 18 g protein per day than in those fed over 20 g per day (p$lt;0.05). The egg production rate for the overall period was the highest in hens receiving 18 g protein per day, but there were no significant difference in egg production rate among those fed protein levels ranging from l.6 to 22 g per day, and increasing the daily allotment over 24 g resulted in a significant decrease in egg production (p$lt;0.05). 2. Average egg weight during the age of 24-30 weeks was not significantly different among different levels of protein allotment. However after that period, increasing the protein allotment from 16 to 20 g per day resulted in an almost linear increase in average egg weight (p$lt;0.05) and a further increase in daily protein allotment over 20 g had no beneficial effect. There were no significant differences in egg mass per hen among treatments during the whole period. 3. Feed requirement per egg was not significantly different among treatments during the period of 24-30 and 30-42 weeks of age but as a whole it increased as the daily protein allotment increased during the periods of 42-64 and 24-64 weeks of age (p$lt;0.05). However, there were no significant differences in amounts of feed required per kilogram of total egg mass through the whole period. 4. Increasing the protein allotment from 16 to 28 g per day resulted in a significant increase in body weight gain (p$lt;0.05). Significant differences were observed in fertility of breeding egg but these did not follow any specific pattern in relation to protein intake. There were no differences in hatchability among treatments. 5. With increasing the level of daily protein intake, utilizabilities of dry matter, crude protein, carbohydrate and energy tended to decrease and that of crude fat improved (p$lt;0.05). It was concluded that the minimum daily protein allotment of broiler breeder hens to obtain the maximum egg production rate and average egg weight was 20 grams.