The objective of this research was to know optimal level of lysine addition to basal feed on the performance of arabian chick (Silver brakel kriet) cock starter phase. This research was held for 2 months on Balai Pembibitan Ternak Unggul Sapi Dwiguna dan Ayam Sembawa Banyuasin. Completely Randomized Design was used in this research with 5 treatments; L0 (100% + 0% lysine basal diet), L1 (100% b…