الفهرس 
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Abstract
The present study was carried out to evaluate the effect of
Methionine and Lysine supplementation to high or low crude
protein corn-soybean diets on Hubbard broiler chicks’ growth
performance, carcass characteristics and economic evaluation.
Two levels of crude protein: (1) High protein (HCP), while were
standard to Hubbard broiler chicks requirements, 23, 21and 19 %
CP for starter, grower, and finisher diet, respectively. (2) Low
protein (LCP), 21, 19 and 17 % CP for starter, grower, and finisher
diet, respectively, were used. High protein diets supplemented with
three levels of Methionine (Meth) and Lysine (Lys): 100 (control),
80 and 120 %. Low protein diets supplemented with three levels of
Meth and Lys: 100 (as a control), 120 and 140 % to form six
experimental diets. These dietary treatments were fed to 360 1-day
old unsexed broiler chicks which divided into six dietary treatments
of four replicates each.
The results obtained were summarized as follow:
The highest final live body weight and daily weight gain were recorded for chicks received diets contained high or low crude protein with 100 % Meth and Lys addition during the experimental period. The overall experimental period (1 – 35 d day of age), broiler chicks fed on HCP with 100 % Meth and Lys addition had the highest values for daily feed consumption and the worst feed conversion ratio compared to the other experimental treatments.
Overall, Regardless to NFE digestibility the broiler chicks which fed on diets HCP or LCP supplemented by lys and meth.