This study was set for more than one year to evualte the effects of dietary addition of selenium-enriched dried algae on productive andreproductive performances of Barki sheep. Twenty eight ram-lambs (aged 4-5 months) were randomly divided into four equal groups (n=7). Basal concentrate mixture was prepared and supplemented with or without Se-algae (selenium enriched micro-algae Spirulina, Atrhrospira platensis). Four experimental concentrate mixtures were prepared, the control (basal concentrate mixture without any supplementation) (I) and the other three experimental concentrate mixtures (II, III and IV) were supplemented by Se- algae at levels of 0.2; 0.4 and 0.6 mg/kg DM of the diet, respectively. Animals of the four groups were randomly assigned to feed on one of these four concentrate mixtures. In addition of concentration mixture animals of all groups were fed ad libitum on berseem hay.Feed supplementation with Se-algae significantly increased animal's final live body weights and weight gains compared with control group. Significant increases in white blood cells counts were observed in animals fed diets supplemented with Se-algae when compared with the control group. Animals receiving concentrate mixture supplemented with Se-algae at 0.4 mg recorded the highest (P<0.05) value of packed cell volume when compared with the other two treatment groups. Dietary inclusion of different levels of Se-algae resulted in significant increases in blood total protein and albumin relative to the control group. The lowest value (p < 0.04) of plasma globulin was  observed in group fed diet containing Se-algae at 0.6 mg. Plasma urea nitrogen was significantly increased as a result of supplementing diets with 0.4 mg of  Se-algae. However, Se-algae supplementation reduced plasma cholesterol (p < 0.046) and total lipid (p < 0.0001) contents as compared with the control group. The plasma aspartate aminotransferase (AST) and alkaline phosphatase (ALP) levels of ram-lambs were significantly affected by adding Se-algae to their diets. Significant increases in T-AOC, GSH-Px and SOD as Se-algae level increased. Conversely, plasma malondialdehyde (MDA) was significantly decreased in a dose-dependent manner. Sperm ejaculate volume, progressive motility, normal sperm, live sperm, total sperm output, total motile sperm and total functional sperm fraction (TFSF) were increased (P≤0.05) in groups supplemented with Se-algae comparing with the control group. As opposed to the previous effect, sperm concentration, abnormal sperm and dead sperm significantly (P≤0.05) decreased comparing with the control group. Seminal plasma total protein increased (P<0.05)in the groups given 0.4 and 0.6 mg Se-algae. Seminal plasma albumin increased (P<0.05)in the group that received 0.4 mg Se-algae diet as compared to the control group, while seminal plasma globulin was decreased (P<0.05).Seminal plasma total lipids decreased (P≤0.02). Seminal plasma cholesterol and triglycerides were not significantly affected. Seminal plasma ALT and ALP significantly (P≤0.01) decreased due to including Se-algae in ram-lambs diet as compared to the control group.In conclusion, addition of Se-algae to the diet of ram-lambs improved their growth performance, semen quality, antioxidant status and blood constituents during rearing periods.