The HU are commercial broiler breeders, B2 is a new Egyptian broiler cross-line between Arbor Acres males and Egyptian native White Baladi females in the 8th generation and FA is an Egyptian native breed. There were 12 groups (4 replicates per group) arranged factorially with 3 broiler breeders (HU, B2 and FA) and 4 ESTs (0, 3, 7 and 10 d).