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Influence of dietary levels of lipid and vitamin E on growth and resistance of Nile tilapia to Streptococcus iniae challenge

Permanent URL:
http://handle.nal.usda.gov/10113/36779
Abstract:
A study was conducted to determine the effect of dietary levels of lipid and vitamin E on growth performance, immune responses and resistance of Nile tilapia to Streptococcus iniae challenge. A basal purified diet (35% protein and 3.4kcal DE/g) supplemented with 6, 10 and 14% of 1:1 mixture of corn oil and menhaden fish oil was each supplemented with 50, 100 and 200mg vitamin E/kg. Each diet was fed to Nile tilapia in triplicate aquaria for 12weeks. Weight gain, feed intake and survival were not affected by dietary levels of either lipid or vitamin E. Feed efficiency in fish fed 14% lipid diets was significantly lower than that fed 6% dietary lipid but these did not differ from that of the 10% dietary lipid diet. These variables were not affected by dietary vitamin E levels. Whole body lipid significantly increased in fish fed 14% lipid diets and 100mg/kg vitamin E diets. Liver α-tocopherol levels were reflective of dietary levels of vitamin E. Increasing dietary levels of lipid to 14%, however, significantly decreased liver concentration of α-tocopherol. Hematological parameters and hepatosomatic indices were not affected by dietary treatments. Serum protein significantly increased in fish fed 14% lipid diets but was not affected by supplemental levels of vitamin E. Lysozyme activity was not affected by dietary lipid levels but significantly increased in fish fed 200mg vitamin E diets. Alternative complement activity significantly decreased in fish fed 10 or 14% dietary lipids but increased when dietary vitamin E levels was increased to 100 or 200mg. Dietary lipid and vitamin E levels had no effect on the resistance of Nile tilapia to S. iniae infection and on antibody titer against that bacterium.
Author(s):
Lim, Chhorn , Yildirim-Aksoy, Mediha , Li, Menghe H. , Welker, Thomas L. , Klesius, Phillip H.
Subject(s):
Oreochromis niloticus , tilapia (common name) , freshwater fish , animal growth , immune response , body composition , proximate composition , blood proteins , lysozyme , complement , disease resistance , fish diseases , bacterial infections , Streptococcus iniae , animal pathogenic bacteria , feed composition , feed supplements , vitamin supplements , corn oil , fish oils , vitamin E , dietary fat , lipid content , vitamin content , fish culture , freshwater aquaculture
Format:
p. 76-82.
Note:
Includes references
Source:
Aquaculture 2009 Dec. 16, v. 298, no. 1-2
Language:
English
Publisher:
Amsterdam: Elsevier Science
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.