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Abstract
The present study was performed at the Poultry Research Unit, Faculty of Agriculture (Saba Basha), Alexandria University, during the period from November 2002 to January 2003. A factorial design (2 x 3) was used in this experiment to study the effect of protein source (animal and plant protein) without or in the presence of some feed additives (Rumien and Biogen) in the starter and grower diets on the growth performance, carcass quality, blood constituents and economical efficiency. One hundred and forty-four, 7-day old unsexed Hubbard broiler chicks were divided at random into six groups with twenty-four chicks in each group which was allotted into three replicates (8 each). Chicks in all experimental groups were fed a starter diet from 7 to 21 days of age and were fed a grower diet from 22 to 42 days of age. In this experiment, two dietary protein sources were used (plant and animal protein). Within each protein source, three diets were formulated, the first was without any supplementation, the second was supplemented with 1 g Roemin-W2 / Kg diet and the third diet was supplemented with 2 g Biogen / Kg diet. Results obtained could be summarized as follows: 1- There was a positive relationship between Animal protein (AP) and live weight gain as compared to plant protein (PP). Chicks fed diet containing AP source recorded higher live body weight gain by 21.8, 24.7, 23.5, 15.4 and 24.2 % than those fed diet containing PP only during the 2nd, 3rd, 4th, 5th and 6th weeks of age, respectively. 2- The chicks fed AP-diet recorded the highest (P ? 0.0001) values of feed or protein consumption reached 37.8, 21.3 and 25.0 % compared to PP-diet, during the experimental periods 1-3, 3-6 and 1-6 weeks of age, respectively.