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Animal Science Abstract
Re-evaluation of the vitamin E requirements of juvenile tilapia (Oreochromis niloticus 5 O. aureus)
S. Y. Shiau1 and L. F. Shiau1
1Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of ChinaAbstract
A 10-week feeding trial was conducted to re-evaluate the level of dietary vitamin E (dl-a-tocopheryl acetate) that was adequate for juvenile tilapia Oreochromis niloticus 5 O. aureus given diets containing two dietary lipid concentrations. Purified diets with eight levels of vitamin E (0, 25, 50, 75, 100, 150, 200, 400 mg/kg diet) at either 50 or 120 g lipid per kg were each given to three replicate groups of tilapia (mean weight: 0·69 (s.e. 0·02) g) reared in a closed, recirculating system. Food efficiency and protein deposition were significantly (P < 0·05) higher in fish given 50 mg vitamin E per kg diet and 75 mg/kg diet in the 50 and 120 g lipid per kg groups respectively, compared with fish given the unsupplemented control diet. Mortality of fish was not affected by dietary treatment. Weight gain and liver microsomal ascorbic acid-stimulated lipid peroxidation data analysed by broken-line regression indicated that the optimum dietary vitamin E requirements in juvenile tilapia are 42 to 44 mg vitamin E per kg and 60 to 66 mg vitamin E per kg in 50 and 120 g lipid/kg diets, respectively.
Keywords: fishes, tilapia, vitamin E
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