Effect of Dietary Tryptophan Levels on Growth and Hemato-Immunological Parameters in Juvenile Nile Tilapia Oreochromis niloticus

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dc.contributor.authorWu Y.
dc.contributor.authorZhang L.
dc.contributor.authorTeng T.
dc.contributor.authorSun R.
dc.contributor.authorWang W.
dc.contributor.authorWang Y.
dc.contributor.authorMi H.
dc.date.accessioned2018-11-20T20:10:08Z
dc.date.available2018-11-20T20:10:08Z
dc.date.issued2018
dc.description.abstractAn 8-week feeding trial was conducted to evaluate the effects of dietary tryptophan on growth performance, feed utilization, hematological parameters and non-specific immune responses of juvenile Nile tilapia. Six isonitrogenous and isoenergetic diets were formulated to contain graded levels of L- tryptophan (0.102%, 0.171%, 0.223%, 0.284%, 0.331% and 0.391% of dry weight respectively) from dietary ingredients and crystalline tryptophan. Each diet was randomly assigned to triplicate groups of 25 juvenile fish (1.41±0.01g) three times daily (8:30, 12:30, and 17:00 hours) to apparent satiation. Results showed that weight gain (WG) and special growth rate (SGR) increased with increased dietary tryptophan levels up to 0.284% and remained nearly the same thereafter. Dietary tryptophan requirement was best expressed by the quadratic regression equation y=-6251x2+3525x+538.1 R²= 0.895; based on weight gain against dietary tryptophan levels, with optimal dietary tryptophan requirement estimated to be 0.282% of the diet; corresponding to 6.24% of dietary protein on a dry weight basis. Tryptophan supplementation had no impact on the survival rate, body composition, antioxidant activities, hematological parameters, and non- specific immune parameters of tilapia. Our study indicated that tryptophan supplementation enhanced growth and promoted normal physiology. Our findings could be useful in the aquaculture industry.
dc.format.extent12 pages
dc.identifier.issn0792-156X
dc.identifier.urihttp://hdl.handle.net/10524/59310
dc.subjectdietary tryptophan
dc.subjectgrowth performance
dc.subjecthematological parameters
dc.subjectnon-specific immune responses
dc.subjectNile tilapia juvenile
dc.subjectindex of blood immune function
dc.subject.lcshFish culture--Israel.
dc.subject.lcshFish culture
dc.titleEffect of Dietary Tryptophan Levels on Growth and Hemato-Immunological Parameters in Juvenile Nile Tilapia Oreochromis niloticus
dc.typeArticle
dc.type.dcmiText

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Volume 70, 2018