T he experiment was conducted in Instructional Livestock Farm complex, OUAT, Bhubaneswar during January-March, 2014 to study the performance of coloured synthetic broiler fed with dried Azolla as protein substitute. 150 day-old chicks were reared and distributed randomly in five dietary treatments with 3 replicates each. The five dietary treatments of the experiment were: C1: Basal diet, T1: Basal diet+10% dietary protein from Azolla, T2: Basal diet+10% dietary protein from Azolla+k-EnzymeTM,

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... : Basal diet+15% dietary protein from Azolla, T4: Basal diet+15% dietary protein from Azolla+k-EnzymeTM. Each of the Azolla fed group compared to control, showed significantly (P≤0.05) higher body weight and feed consumption in every week from 3 rd to 7 th week. The antibody titres (log2) against SRBC (sheep red blood corpuscles) inoculation of 6 th week old broiler chicks were insignificant (P>0.05) difference among different groups. However, each of Azolla fed groups had numerically higher titre values than the control. The CBH (cutaneous basophil hypersensitivity) responses were 135.51±2.53, 169.35±0.86, 158.08±3.82, 181.82±0.97 and 178.35±15.19 for C1, T1, T2, T3 and T4, respectively with significant (P≤0.05) differences between the treated groups. Each of the Azolla fed group, except T2 had significantly higher CBH response than the control. On basis of net return/kg live weight, each of Azolla fed groups showed higher economic efficiency than the control. T3 showed the highest efficiency followed by groups T4, T2 and T1.