This study examines the hypothesis that tyrosine and tryptophan and canthanthin either alone or in combination in absence or presence of sulphate ion, can improve the performance of local laying hens in post-peak period (39-58 weeks). A total number of 360 hens plus 36 cocks 39 weeks old from Inshas  strain were equally divided into 12 group with 3 replicates (10  hens+ 1 cocks each) and housed in wire cages  . The experimental hens fed from 39 to 58 week of age the control diet without or with 6 ppm   Canthaxanthin (CAN) , 0.05% tyrosine(TYR) , 0.05% tryptophan(TRY)  , 6 ppm CAN + 0.05% TYR, 6 ppm CAN + 0.05% TRY . The rest of treatments from were fed the same previous treatments plus 0.5 % anhydrous sodium sulphate (SS). The most important results obtained were as follow: 1-All dietary feed additives used in this study increased egg number, egg mass and   shell thickness . 2-The addition of SS increased the beneficial effect of CAN,   TYR  and TRY. 3- The carotenoids  like CAN with   TYR or TRY in presence or absence of SS can   improve  the egg production, fertility and hatchability of  developed laying hens in   post-peak period. In conclusion, the mixture of CAN+TYR+SS was the most successful additive on productive performance.