Abstract
In the study five iso-nitrogenous and iso-energetic diets were formulated. T1 was a control with DCP (di-calcium phosphate) supplementation, T2 without DCP, T3 was a T2 supplemented with Acidifier (0.3% formic acid), T4 was a T2 supplemented with phytase (750 FTU/kg) and T5 was a T2 supplemented with Acidifier and phytase. Tra catfish fingerlings (15g) were cultured in 500 liter composite tanks in 10 weeks. The study indicates dietary supplementation of phytase (T4 and T5) significantly improved growth performances, ameliorated feed utilization and increased ash content of the whole body and bone phosphorus of juvenile Tra catfish. The study also indicates supplementing acidifier also improved growth performance, ameliorated feed utilization and increased ash content of the whole body and bone phosphorus. The decreased pH value of gastric juice due to the acidifier supplementation can accounts for the present result. However, mixture of phytase and an acidifier in T5 treatment does not have any ameliorated effect when compared to the separated phytase or separated acidifier. It seems the synergic effect of a mixture does not exist in the study. Some studies are needed to find out the suitable mixture of the two feed additives in Tra catfish feed.
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