The research was carried out using 1728 broiler chicks (shifer starbro hybrid), They were divided into eight groups, each one consists of three replicates with 72 birds in every repetition .The birds of all repetitions were fattened until 49 days in separate pen of open type walk ,and on deepbedplate .All conditions of placement, rearing and feeding were the same for all birds of repitition in different groups.