عنوان مقاله [English]
This experiment was conducted to evaluate the effect of different levels of dietary chromium picolinate on the growth performances (final weight (FW), specific growth ratio (SGR), weight gain (WG) and condition factor (CF)), feed indices (feed conversion rate (FCR) and protein efficiency ratio (PER)) hematology (hemoglobin (Hb), red blood cell (RBC), white blood cell (WBC) and liver lipid levels (cholesterol and triglyceride)) of Indian mackerel (Rastrelliger kanagurta) for 60 days. In this experiment, 120 Indian mackerel (with average weight of 7.18±1.01 g) were divided to four treatments and three replicates (n=10 in each replicate) in a completely randomized design and fed with diets containing 0, 600,800 and 100 µg chromium picolinate/kg food, respectively. The present results showed that the highest FW, SGR, CF, PER, WG and the lowest FCR were observed in the diet containing 600 µg/kg chromium picolinate in all of the parameters. Treatment two (600 µg /kg) showed a significant difference compared with control treatment (P<0.05). Treatment containing 600 µg /kg chromium picolinate had significantly reduced liver cholesterol and triglyceride levels compared with those in other treatments. The highest WBC, RBC and hemoglobin were observed in treatments containing 600 and 800 µg/kg chromium picolinate. Treatment containing 1000 µg/kg chromium picolinate was not affected in all growth parameters and hematology (P>0.05). Finally, the present results suggest that diet containing 600 and 800 µg/kg dietary chromium picolinate could improve growth and hematology indices and liver lipid levels of Indian mackerel.
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