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There were three control treatment groups: basal diet without Cp challenge (unchallenged control),basal diet with Cp challenge (negative control) and basal diet supplemented with 45 ppm activeingredients of Zn-bacitracin and 100 ppm monensin (positive control). Addition of plant extracts orprebiotic compounds neither improved performance nor reduced NE lesion scores in diseasechallengedgroups. The birds on positive control diet showed better performance throughout theexperimental period (Table 3.8). An overall 8.8 % NE-related mortality was recorded, with meanjejunal and ileal lesion scores in dead birds ranging from 3.03 to 3.90 in all challenged groups exceptthe positive control groups. Necrotic enteritis-specific deaths or clinical abnormalities were notobserved with unchallenged control and positive control groups. Chi-square analysis revealed that theFibregum-supplemented group had a lower (P