Comparison of the performance between three strains of broiler chicks in Iran

In order to compare performance in three commercial broiler strains, 36ooo day-old broiler chicks Hubbard f15, Cobb-500 and Ross308, were divided into 3 equal groups with 2 replicates and 6000 birds per replicate. The birds were reared under similar conditions from 1 day-old to 49 days of age. The performances of birds including weight gain, feed intake, feed conversion ratio (FCR), livability and flocks production index were measured. Results showed that there was significant differences in weekly weight gain among hybrids (p