Aims: The aim of the present study was to investigate the immunoval prebiotic performance on growth indices, hematological parameters, and rainbow trout carcass composition.
Materials & Methods: Immunoval prebiotic was added to the diet in 4 levels of 0.05%, 0.1%, 0.15% and 0.2% and a diet without prebiotic was used to feed the control group. Each diet was randomly used for fish with an initial weight of 13.66±0.54g in three replicates.
Findings: After 8 weeks of feeding, the final weight of fish fed with 0.1%, 0.15%, and 0.2% prebiotics was significantly higher than the fish of the control group (p<0.05). The food conversion ratio in all treatments fed with prebiotic was significantly lower than the control group (p<0.05) and the lowest amount was in 0.15% treatment. The specific growth rate in fish fed with prebiotic was higher than the control group (p<0.05). Also, there were significant differences in the parameters of red blood cells, white blood cells, lymphocyte and neutrophil in fish fed with prebiotic diet and the control group (p<0.05). In the carcass analysis, protein content was significantly higher than the control group and the highest amount was seen in 0.1% treatment. The amount of fat and carcass ash decreased significantly in the control group and the lowest amount was observed in 0.15% treatment.
Conclusion: Addition of immunoval prebiotic with 0.2-0.15% rate to rainbow trout diet had positive effects on growth indices, blood parameters, and carcass composition