The Effect of Phytase Enzyme Supplementation to Hazelnut Meal Based Diets on Growth Performance and Nutrient Digestibility of Siberian sturgeon (Acipenser baerii)

This study was carried out to determine the effects on growth performance of diets based on hazelnut meal 30% supplemented with different rates of phytase enzymes in Siberian sturgeon (Acipenser baerii) (initial weight, 960.23 ± 0.55 g). The experimental diets were consisted of with no added enzyme in the control group (G1) and diets supplemented with 0.25 g/kg (G2), 0.50 g/kg (G3) and 1.00 g/kg (G4) phytase enzyme, respectively. Experiment groups were performed in 3 replicates and carried on with 90 days. As a result of the research, it was determined that the addition of phytase enzyme in diets had a positive effect on the growth with weight gain (WG, g), specific growth rate (SGR, %), feed conversion ratio (FCR) and protein efficiency ratio (PER). The growth performance of all phytase enzyme supplemented groups were found to be more successful than the control group (P<0.05). The G4 enzyme group was found to be statistically better than the others (P<0.05). In terms of digestibility effect of enzyme added groups, the highest total digestion rate (77.14 ± 0.07 %) was obtained in the G4 enzyme group and the lowest total digestibility (74.32 ± 0.02%) was obtained in the G1.