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This experiment was conducted in the poultry field of Al-Anwar Company in Babil governorate for a period from 11/8/2020 until 12/12/2020 (35 days). In this experiment, 315 chicks from the commercial hybrid (Ross-308) one day old without diagnosis their sex, Chicks were raised in cages with dimension of (1 x 1.5 m.). The chicks were divided randomly into 7 transactions, by 3 replicates for each treatment, and each one included 15 chicks, the experiment parameters were as follows: The first treatment T1: the control treatment without addition, the treatment T3, T2 addition of nano-selenium at a concentration of (0.3 and 0.5) mg / kg respectively, the treatment T5 and T4 addition of astaxanthin at a concentration of (60, 70) mg / kg respectively, while the sixth treatment, T6, included The mixture of nano-selenium with astaxanthin at a concentration of (0.3 + 60) mg / kg and the treatment T7 was the mixture of nano-selenium with astaxanthin at a concentration of (0.5 + 70) mg / kg. In this study, we reached the following results: A significant (p <0.05) superiority was obtained in the live body weight of T7 and T4 in the fifth week of the experiment. It was found that there was a significant increase (P <0.05) in the overall weight increase rate of treatment T7, and this treatment was also distinguished by the other transactions in the fifth week. It was evident that there was a significant decrease (P <0.05) for the treatment T3 in the fifth week and the total feed consumption rate. There was a significant improvement (P <0.05) in the total dietary conversion factor for the treatment T2. The percentage of total losses decreased in the two transactions T7 and T5 compared to the control treatment, with an increase in their ratios in treatment T2.