In this experiment Glycomoss (G) or Mox (M) (foreign and local products, respectively) were used as a source of mannan oligosaccharides (MOS) and β –glucans (28%mannan oligosaccharides and 34% β-glucans). A total number of 225 unsexed-one-day old Japanese quail chicks were individually weighed and randomly distributed into 5 equal experimental groups with three replicates of 15 chicks each. The first group (T1) was fed the basal diet and served as control group. The second (T2) and third (T3) groups were fed the basal diet supplemented with Glycomoss (G) at 0.50 and 0.75 g/kg, respectively. The fourth (T4) and fifth (T5) groups were fed the basal diet supplemented with Mox (M) at 0.50 and 0.75 g/Kg, respectively. The experiment lasted for 6 weeks. The results obtained could be summarized as follows: quail chicks of T2 had the best values for live body weight (LBW), live body weight gain (LBWG), feed conversion ratio (FCR) and mortality rate (MR%) followed by T3, T4 and T5 treatment groups compared with the control diet. Also, chicks of T2 had significantly (P ≤ 0.05) higher eviscerated carcass and dressing percentages, and significantly (P≤0.05) lower abdominal fat% as compared to dietaries supplementation and control groups. Concerning edible giblets and lymphoid organs, it could be observed that T2 (0.50g G/kg diet) exhibited the highest relative lymphoid organs weight (thymus, bursa and spleen). Meanwhile, the highest percentages of liver and gizzard were recorded for T3 (0.75g G/kg diet). All dietary additives significantly reduced the total counts of anaerobic and E. coli bacteria, at the same time they increased the beneficial bacteria counts (lactobacillus).