Effect of organic selenium on growth, immune response and resistance of Labeo rohita to Aeromonas hydrophila infection

Abstract

A 60 day feeding trial was conducted to evaluate organic selenium supplementation in the diet of fingerling Indian major carp, Labeo rohita. A basal diet was formulated to contain 30% protein. Three levels of organic selenium (1, 2 and 3 g kg-1 diet) were added to the basal diet. Each diet was fed to the 3 replicate groups of fingerling Labeo rohita twice a daily @ 5% of the body weight. After the feeding trial of 60 days an Aeromonas hydrophila challenge study was conducted to test the effects of diet on disease resistance. NBT test and total serum protein were carried out to assess the immune response. The weight gain%, survival, NBT levels and Relative Percent survival (RPS) were significantly higher in Labeo rohita fingerlings fed with organic selenium incorporated diets than in control groups.