This experiment was conducted at the poultry farm of Animal Resource Department- College of Agriculture -
Kirkuk University during the period from 6/9/2015 to 14/11/2015 for 70 days (10 weeks) to study effect of different levels of energy, protein, methionine and lysine without variation the value of calorie protein ratio upon the performance and quality traits of egg of ISA BROWN laying hens . Actual experience started from 16/9/2015 used 105 layer aged 40 weeks were randomly assigned to 7 treatments with 5 replicates of 3 hens per replicate placed in a vertical batteries contain four floors and each floor contains three cages with dimensions ( 45 × 30 × 37 cm Length, width and height respectively ) with one hen/cage . Fed and water was ad libitum and the treatments of this study were : T1: (control treatment) 2800 Kcal ME/Kg diet with 17 % crude protein , T2: 2882 Kcal ME/Kg diet with 17.5 % CP , T3: 2718 Kcal ME/Kg diet with 16.5 % CP , T4: 2635 Kcal ME/Kg diet with 16 % CP , T5: 2882 Kcal ME/Kg diet with 17.5 % CP + excess of 10 % above nutritional requirements of methionine and lysine , T6: 2718 Kcal/Kg ME with 16.5 % CP + 10 % above nutritional requirements of methionine and lysine , T7: 2635 Kcal/Kg ME with 16 % CP + 10 % above nutritional requirements of methionine and lysine with constant calorie protein ratio at 164.7 of all treatment . The results showed that T2 and T5 improved significantly (P<0.05) in feed intake and feed conversion ratio compared to other treatments and significantly differences (P<0.05) in egg specific gravity , eggshell thickness , eggshell percentage , haugh unit and albumen index , while no significantly differences (P<0.05) in egg production , egg weight , egg mass , egg surface area , yolk index , yolk percentage , albumen percentage between all treatments . treatments addition methionine and lysine improved feed intake , feed conversion ratio , energy conversion ratio , protein conversion ratio and eggshell thickness compared treatments no added of these two amino acids .