عنوان مقاله [English]
نویسندگان [English]چکیده [English]
An experiment was conducted to evaluate the effect of dietary nucleotide on growth performance and body composition of Nile tilapia (Oreochromis niloticus). Four experimental diets were formulated by using different levels of exogenous nucleotide consist of 0 (control), 0.05, 0.1, and 0.15 percent. Each diet was randomly allocated to triplicate groups of fish with initial average weight of approximately 52 g. Fish were fed on experimental diets during the 45 days of culturing period at the rate of 2-3 % biomass two times per day. Results showed that some growth indices such as final weight, weight gain, daily growth rate and specific growth rate significantly increased by increasing nucleotide level, while feed conversion rate decrease by increasing nucleotide level. Body composition analysis showed that protein content increased by increasing nucleotide levels but fat and ash content decreased insignificantly. There was an increasing trend in the level of some hematological parameters but there were no significant changes among groups (P>0.05). So it seems that nucleotide administration improve the growth performance but it has no effect on hematological parameters and body composition of Nile tilapia.