Effects of Phytase Enzyme Supplementation to Hazelnut Meal Based Diets on Growth Performance and Nutrient Digestibility of Siberian sturgeon (Acipenser baerii Brand, 1869)

This research was carried out to determine that the effects of diets containing 30% hazelnut meal and different proportions of phytase enzymes on the growth performance of Siberian sturgeon ( Acipenser baerii) (initial mean weight, 960.23 +/- 0.55 g). The trial diets consisted of feeds supplemented with 0.25 g kg(-1) (G2), 0.50 g kg(-1) (G3), and 1.00 g kg(-1) (G4) phytase enzyme, and with no enzyme added to the control group (G1), respectively. Experiment groups were performed in 3 replicates and trials were carried out for 90 days. As a result, adding phytase enzyme to feeds contain 30% hazelnut meal was found to have a positive effect on the weight gain (WG, g), the protein efficiency ratio (PER), feed conversion ratio (FCR), and specific growth rate (SGR, %). Growth performance was found to be more successful in all groups fed feeds supplemented with phytase enzyme compared to the G1 group (P<0.05). The G4 was the best group than the others statistically (P<0.05). In terms of the 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 estimated in the G1.