Function of dietary addition of betaine on growth performance and improve immune system in beluga, Huso huso

A feeding trial was conducted to examine the effects of dietary supplementation of betaine (0.5, 1, 1.5, 2 & 2.5 % Betaine kg-1 diet) on growth, nutrient utilization, carcass compositions and haematological- biochemical parameters in beluga, Huso huso. 300 fish with average weight of 4.6 ± 0.61 g were fed to triplicate groups of experimental diets for 12wk. Significant higher weight gain, specific growth rate, protein efficiency ratio, condition factor and feed efficiency ratio were observed in fish fed diet supplemented with optimum levels of Betaine than that of fish of control dietary group. The best growth performance and nutrient utilization was observed in fish fed diets containing 1.5 -2 % Betaine kg-1 diet (p<0.05). liver enzymes (Alanine aminotransferase and Aspartate aminotransferase) in fish fed diet containing 1.5 and 2 % Betaine kg-1 diet were significantly higher than those of fish fed basal diet. Based on the results of this study, could say that increased levels of Betaine in the diets of juvenile beluga up to 1.5-2 % kg-1 diet, improved growth performance, feed utilization and haematological- biochemical parameters.