INTERACTION BETWEEN DIFFERENT LEVELS OF VITAMIN AND MINERAL PREMIX AND EUBIOTIC IN DIETS ON PERFORMANCE OF NILE TILAPIA JUVENILE

The objective of this work was to evaluate the effect of diets supplemented with different levels of Rovimix® premix (DSM nutritional Products, Basel, Switzerland) and the presence of eubiotic Rovimax® Boost on juvenile feeding of Nile tilapia (Oreochromis niloticus) on zootechnical performance of Nile tilapia juveniles.

A 3x2 factorial experiment was conducted with six diets, isocaloric and isoproteic, formulated to meet the nutritional requirements of the species, with three different levels of Premix Rovimix® (1.0; 1.5; 2.0 Kg.ton^-1), and the presence or absence of eubiotic. Rovimax® Boost at a concentration of 4.0 Kg.ton^-1 in the diet. Fifteen fish per tank (initial weight 1.85 g ± 0.24) were fed until apparent satiety 4 times daily for 50 days with four replications per treatment. At the end of the experiment the following indices were determined: final weight (g), weight gain (g), feed conversion and feed efficiency (%). The data were tested by two-way ANOVA and we applied Tukey's test to compare the means when necessary. For all analyses, we used the software Statistica 10.0 (Statsoft Inc., Tulsa, USA) and adopted a significance level of 5%

All parameters were affected by the presence of eubiotic. The presence of the eubiotic improved all parameters. Final weight, weight gain, feed conversion and feed efficiency were affected also by the premix supplementation. Interaction between premix and immunostimulant supplementation was founded in final weight, weight gain, feed conversion and feed efficiency.