Effects of dietary mannanase on growth, metabolism and non‐specific immunity of Tilapia (Oreochromis niloticus)

An experiment was designed to assess the effects of a commercial β-mannanase on performance and immunity of tilapia fed plant-based diets. A basal diet was supplemented with 0.0 (control), 0.5 and 1.0 g β-mannase kg−1 to formulate three experimental diets. Each treatment contained 4 tanks with 30 fish per tank. Trial lasted 8 weeks. Our results demonstrated that β-mannanase addition (0.5 and 1.0 g kg−1) improved significantly (P   0.05). β-mannanase supplementation also led to an increase (P   0.05). Moreover, the dietary β-mannanase supplementation groups exhibited an increase in the total leukocyte counts (WBC), differential leukocyte counts, respiratory burst activity, lysozyme activity and superoxide dismutase (SOD) activity compared to the controls (P < 0.05). In conclusion, β-mannanase addition to tilapia diets improved feed utilization and non-specific immunity resulting in improvements in growth performance.

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