Twenty eight Damascus kids weighed 16.5 ±0.219 kg on average were used in feeding trial for 135 days. Animals were divided into four similar groups (7 head each) to study the effect of feeding supplemented rations with yeast culture to growing kids on its performance and carcass characteristics. Four experimental animal groups received four experimental rations as follows: Treatment-1 (T1): 2% of LBW concentrate feed mixture + 0.5 % of LBW berseem hay along wheat straw ad-lib. (control ration)

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... reatment-2 (T2): control ration + 5gm Moreyeast (Y) /head/day Treatment-3 (T3): control ration + 1gm yeast with selenium (YS)/head/day Treatment-4 (T4): control ration + 2.5gm (Y) + 0.5 gm (YS)/head/day The results obtained can be summarized as follow: 1-Using yeast culture as feed additive was not affected on different nutrient contents in experimental rations, however total DM intake was increased with supplemented rations with yeast than that in control one. 2-Animals fed tested rations (containing yeast culture) appeared to higher in total and daily gains especially with (T3) which get the best daily gain by about 33.67% as compared to control group. 3-Animals fed (T3) containing 1gm YS/head/day recorded the most economical efficiency 3.27 and 2.19 according to year 2009 and 2011, respectively. This group had the lowest feed cost to get one kg gain, being 7.65 and 13.68 LE for the respective time compared with the other groups. 4-Animals fed T3 and T4 tended to be higher in serum glucose level compared with animals fed T2 and T1 (control group). 5-Using YS (T3) lead to be increase in dressing percentage and then edible offals such as heart, spleen, defatted kidney and tests. Moreover, increase in meat percentage was recorded than other treatment and control. Generally, using yeast culture as feed additives in feeding of growing kids tended to be higher in total and daily gains with lower feed cost to get one kg gain. Moreover, yeast plus selenium supplementation to rations of growing kids tended to higher in both hot carcass and dressing percentage.