Effect of emulsifier on growth performane, blood factors and body composition in rainbow trout (Onchorhyncus mykiss) fed fat powder

This trial was to investigate the effect of emulsifier on growth performance, blood factors and carcass composition in rainbow trout (Onchorhyncus mykiss) fed fat powder diet. A basal diet was formulated using common feed ingredients supplemented with 0.5 and 1% of cholic acid and 2 and 4% of tween80, plus a control diet without emulsifier, leading to five experimental diets. Juvenile rainbow trout with an initial weight of 27.32±2.03 g was fed with experimental diets for 8 weeks. The results showed no significant differences between the value of body weight increasing (BWI), specific growth rate (SGR), feed efficiency ratio (FCR) and hepato somatic index (HSI) (P>0.05) while, visceral somatic index (VSI) was significantly higher in control diet. Emulsifier had significant effects on blood parameters such as white blood cells (WBC), red blood cells (RBC), hematocrit (Hct), hemoglobin (Hb), MCV, MCH and MCHc (P