الفهرس 
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Abstract
The current study aimed to discuss the impact of total sulfur amino acids (TSAAs) %, photoperiod, and their interactions on growth performance, carcass traits, blood indices, microbiological analysis, meat quality and sensory evaluation of broiler chicks. A total of 300 unsexed IR broiler chicks one-week old were used in a factorial arrangement (2×3), including two photoperiod systems (22 L: 2 D and 16 L: 8 D) and three experimental diets having three grades of Met + Cyst (TSAA), 0.9, 1.1 and 1.3% in begging and 0.7, 0.9 and 1.1% in ending terms indicate inclusion of methionine + cystine at the average of 70%, 85% and 100% of total lysine in starter and finisher periods. Results revealed that the higher Live Body weight (LBW) and body weight (BWG) were noticed in birds given TSAA at grades of 0.90 or 1.10% under 22L: 2D photoperiod at five weeks of age and the whole experimental period (1-5 weeks of age), respectively. The highest live of body weight (LBW) and body weight gain (BWG) were recorded in birds received 1.10% TSAA under the long photoperiod compared to the control and the other groups. Birds fed 1.30% TSAA consumed more feed than the other groups. The opposite was found in birds fed 1.10% TSAA under the short photoperiod (16L: 8D). The best feed conversion ratio (FCR) was detected by birds fed 1.10% and 0.90% TSAA diets during the whole experimental period. All carcass traits studied were significantly influenced by TSAA levels, except for the relative weights of abdominal fat and spleen. The interaction effect was significantly impacted on all carcass traits except spleen %. In conclusion, adding TSAA to starter and finisher diets at levels of 1.30, 1.10, and 0.90% under a long photoperiod regime increased broiler performance, carcass characteristics, and certain blood parameters tested.