The objective of this study was to investigate the effects of source (Fermacto, Immuonowall) and level of prebiotic in broiler chick diets on the growth performance.280 day-old Ross 308 broiler chicks allocated to seven treatments and four replications in a randomized complete block design. Treatments were 1) 0%, 2) 0.10% fermacto in the starter period and 0.05% in the grower-finisher period, 3) 0.20% fermacto in the starter period and 0.10% in the grower-inisher period, 4) 0.30% fermacto in the starter period and 0.15% in the grower-finisher period, 5) 0.10% Immunowall in the starter period and 0.05% in the grower-finisher period, 6) 0.20% Immunowall in the starter period and 0.10% in the grower-finisher period and 7) 0.30% Immunowall in the starter period and 0.15% in the grower-finisher period. Source of fermacto prebiotic had higher feed consumption than Source of Immunowall prebiotic in the starter period (p<0.05). fermacto prebiotic had higher weight gain than Immunowall prebiotic in the finisher period (p<0.05). fermacto prebiotic had a better feed conversion than Immunowall prebiotic in the finisher period (p<0.05). On the whole, source of fermacto prebiotic, showed a better performance than source of Immunowall.