The present study was conducted at the sheep farm, research station fields of the faculty of agricultural sciences, University of Sulaimani at Bakrajo. The goal of this study was to evaluate the effects of adding flaxseed on growth performance and some blood constituents of ram lambs. The experiment was conducted in the Autumn of 2014 and involved 12 ram lambs that were divided into 3 groups of 4 animals according to the different levels of flaxseed supplementation: a traditional diet with no flaxseed supplementation (control group), low level (T1) and high level (T2) of flaxseed. The obtained Results concluded that addition of flaxseed in lamb rations had no significant effect on the blood plasma of total cholesterol, LDL and VHDL. In addition the plasma concentration of GOT and GPT enzymes were also not significantly affected by flaxseed supplementation.