The purpose of this experiment was to compare the performance of the crosses of seven different stocks to Cornish males for broiler production. The seven stocks used as female parents were White Plymouth Rocks, Columbians, Barred Plymouth Rocks, New Hampshires, Stock D, Stock C, and Stock H. The first four stocks, WR, Columbian, BR, and NH were the pure Strains that had been maintained at the College of Agriculture, Seoul National University. The Stock D was the female parent stock of a broiler stock produced by a Korean Poultry Breeding Farm. The stocks C and D were the commercial chicken of two different broiler stocks imported from abroad. The commercial chicks of the imported Hubbard Broilers were used as the control to compare with the seven different crosses mentioned above. The average body weight at 8 weeks of age was 1,596 grams for the Hubbard Broilers, 1,563 grams for the C×Cornish, and 1,544 grams for the H×Cornish, all of which were significantly larger than those of other stocks compared. The income per bird over the cost of feed and day-old chick was largest for the C×Cornish, followed in rank by the H×Cornish, Hubbard Broilers, D×Cornish, Columbian×Cornish, NH×Cornish, BR×Cornish, and WR×Cornish. The superior performance of the C×Cornish and H×Cornish appeared to be due to the effect of the genes transmitted from their dams. The hens of the Stock C had a higher rate of laying, and had a heavier egg weight than those of the Stock H. The age at 50% production was 196 days for the Stock C, 195 days for the Stock H and 179 days for the Stock D. The average body weight of the hens at 30 weeks of age was about 3.2㎏ for both Stocks C and H.