Dietary Lecithin Modulates Growth, Selected Hemato-immunological Indices, and Glutathione Peroxidase Activity of Hoven's Carp (Leptobarbus hoevenii)
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Abstract
Beneficial effects of dietary phospholipids on growth performance, hemato-immunological parameters, and antioxidant status in Hoven's carp (Leptobarbus hoevenii) are reported in this study. Experimental fish were fed four isoproteic (40%) and isolipidic (13%) experimental diets supplemented with lecithin at 0, 1, 3, and 5% for 90 days. The results showed that at 30, 60, and 90 days into the feeding trial, fish fed dietary supplementation containing 3% or 5% lecithin showed significantly improved total length, mean body weight, feed conversion ratio, and specific growth rate compared to the control group (p<0.05). No significant differences in condition factor and survival rate were observed between fish receiving dietary lecithin at any tested concentration and the control group (p>0.05). A study on hemato-immunological parameters of fish fed the experimental diets for 90 days revealed the highest red blood cell count in those receiving the 1% lecithin diet (p<0.05), whereas the white blood cell count was significantly higher in fish fed 3% and 5% lecithin diets (p<0.05). In addition, fish fed a 3% lecithin diet showed significantly higher glutathione peroxidase activity than those fed with the control diet or the 1% lecithin diet (p<0.05). These findings suggest that dietary supplementation with lecithin modulates growth and some hematological and immunological parameters, as well as antioxidant activity, in this fish species. Based on the findings, dietary supplementation with lecithin at 3-5% could promote growth, stimulate the immune response, and enhance antioxidant activity in Hoven's carp.
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