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Re-evaluation of the vitamin E requirements of juvenile tilapia (Oreochromis niloticus ✕ O. aureus)

Published online by Cambridge University Press:  18 August 2016

S. Y. Shiau  and
L. F. Shiau
S. Y. Shiau
Affiliation:
Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China
L. F. Shiau
Affiliation:
Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China
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Abstract

A 10-week feeding trial was conducted to re-evaluate the level of dietary vitamin E (DL- α-tocopheryl acetate) that was adequate for juvenile tilapia Oreochromis niloticus ✕ 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 per kg diets, respectively.

Keywords

fishestilapiavitamin E
Type
Non-ruminant nutrition, behaviour and production
Information
Animal Science , Volume 72 , Issue 3 , June 2001 , pp. 529 - 534
Copyright
Copyright © British Society of Animal Science 2001

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