Effect of Dietary Methionine on Taurine Distribution and Non-specific Immune Responses in Juvenile Blunt Snout Bream, Megalobrama amblycephala at A Constant Dietary Cystine Level

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dc.contributor.authorZhang W.
dc.contributor.authorXia S.
dc.contributor.authorGe X.
dc.contributor.authorRen M.
dc.contributor.authorLiu B.
dc.contributor.authorLiao Y.
dc.date.accessioned2018-11-20T20:09:35Z
dc.date.available2018-11-20T20:09:35Z
dc.date.issued2018
dc.description.abstractA 9-week feeding trial was conducted to investigate taurine distribution by supplementation of methionine in juvenile Megalobrama amblycephala at a constant dietary cystine level. Six semi-purified diets were formulated to contain graded dietary methionine levels from 0.39-1.54% in about 0.25% increments. At the end of feeding trial, plasma methionine content significantly increased with increasing dietary methionine level from 0.39 to 1.0% (P < 0.05) and thereafter reached a plateau. The taurine content of muscle, intestine, liver, and eye in the fish fed dietary methionine level ranged from 1.24-1.54% and was significantly higher than that of the control group (P < 0.05). Taurine content of the brain in fish fed 1.54% methionine diet was higher than the fish fed 0.39% (P < 0.05). Cysteine sulfinic acid decarboxylase content significantly increased with increasing dietary methionine level from 0.39-0.85% (P < 0.05) and thereafter stayed at a similar level. Supplementation with methionine significantly increased (P < 0.05) plasma total protein (TP) content, complement 3 (C3) content and superoxide dismutase (SOD) activity (0.85% methionine diet groups), aspartate transaminase (AST) activity (1.24% methionine diet groups) and albumin content (1.0% methionine diet groups). Supplemented groups had significantly decreased plasma urea content (0.85% methionine diet groups) (P < 0.05). In conclusion, these results indicate that crystalline methionine can be utilized efficiently, juvenile blunt snout bream were able to convert methionine to taurine directly, and appropriate dietary methionine supplementation improves non-specific immune responses in blunt snout bream.
dc.format.extent12 pages
dc.identifier.issn0792-156X
dc.identifier.urihttp://hdl.handle.net/10524/59304
dc.subjectMegalobrama amblycephala
dc.subjectmethionine
dc.subjectcystine
dc.subjecttaurine
dc.subjectnon-specific immune responses
dc.subject.lcshFish culture--Israel.
dc.subject.lcshFish culture
dc.titleEffect of Dietary Methionine on Taurine Distribution and Non-specific Immune Responses in Juvenile Blunt Snout Bream, Megalobrama amblycephala at A Constant Dietary Cystine Level
dc.typeArticle
dc.type.dcmiText

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