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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<0.05). Diet containing 0.5% cholic acid showed higher value of WBC while control diet led to higher value of RBC. Results of serum analysis showed that inclusion of emulsifier was effected albumin, glucose and total protein value (P<0.05). 0.5% cholic acid led to the highest value among groups. Assessment of carcass composition showed significant differences among diets (P<0.05). The highest body protein values were observed in diet 0.5% cholic acid while body fat was the lowest in the same diet. It seems that emulsifier could maintain protein by fat utilization and considering no significant differences between different treatments of growth performance addition of 0.5% cholic acid is suggested.

Keywords: Emulsifier, Growth performance, Blood factor, Carcass composition, Rainbow trout

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