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This study was conducted in the field of Animal / College of Agriculture / Wasit University for the period from 15/11/2016 to 26/2/2017. It included 20 Arab male aged 4-5 months and an average weight of 21.50 kg. The lambs were distributed equally randomly with four animals per treatment. experimental treatments were: First treatment: feed control free feed without additive yeast. The second: treatment was 80% of the control diet. The third treatment: 80% of the control diet, plus 5 g yeast / kg feed. The fourth treatment: 70% of the control diet and the fifth treatment: 70% of the control diet plus 5 g yeast / kg feed.The study found the following results: There were significant differences (P <0.05) in the number of RBC and WBC where the first, second and third treatment were had higher values (6.10, 5.65 and 5.85) and (8.67, 7.12 and 7.21) x 310 cells / mL respectively. The significant differences in values of concentration of hemoglobin and Packed cell voulum have similar traind to those of the red and white blood cells (P <0.05) for the first three treatments with the last two treatments. On other hand there were no significant differences in serum urea, total protein, cholesterol, GPT and GOT for different treatment .

Key words: Cholesterol, Protein, Livestock, Yeast