Effects of Dietary Niacin on Growth Performance, Serum Biochemistry, Antioxidant Ability of Liver, Intestinal Digestion, and Absorption in Juvenile Golden Pompano
Effects of Dietary Niacin on Growth Performance, Serum Biochemistry, Antioxidant Ability of Liver, Intestinal Digestion, and Absorption in Juvenile Golden Pompano
Date
2019
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Abstract
Six groups of experimental diets containing different levels (14.9, 22.4, 28.6, 37.9, 42.0 and 77.5 mg/kg) of niacin were formulated. Juvenile golden pompano (initial body weight:7.82±0.07 g) were fed in cages for eight weeks. Results showed that moderate niacin in the diet significantly increased (P<0.05) weight gain rate (WGR), specific growth rate (SGR), and feed efficiency (FER). Dietary niacin levels increased the protein content in whole fish and muscle (P < 0.05). The content of serum high density lipoprotein cholesterol (HDL-C) and total cholesterol (TCHO) increased significantly and triglyceride (TG) content decreased significantly (P<0.05). C3 and C4 content in serum, and activities of lysozyme (LZM), and alkaline phosphatase (ALP) increased significantly (P<0.05). Dietary niacin levels significantly increased (P<0. 05) the catalase (CAT), alkaline phosphatase (ALP), and total antioxidant capacity (T-AOC) of the liver when niacin content was more than 28.6 mg/kg. Dietary niacin levels also improved intestinal digestion and absorption by increasing glutamyl transferase (γ-GT)activity. Quadratic regression analysis on WGR indicated that the optimum dietary niacin level for optimal growth of juvenile golden pompano was 29.85 mg/kg.
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Trachinotus ovatus,
growth performance,
serum biochemistry,
hepatic antioxidative ability,
intestinal digestion,
absorption,
niacin requirement
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10 pages
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The Israeli Journal of Aquaculture - Bamidgeh
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