Abstract
The main objective of this study was to evaluate the effect of a new isolated exogenous Beta-propeller phytase (FTEII) obtained from Pichia pastoris, on growth, survival and energy partition of juveniles of Litopenaeus vannamei fed a plant protein diet. Two treatments were designed for the experiment: a plant protein-based diet without phytase (T1), and adiet comprisingpretreated plant protein with Beta-propeller phytase (T2). The gowth rate monitored over 30 days significantly improved when phytase was added to the diet (T2) compared to control T1(p<0.05), and survival rates were similar between treatments (p>0.05). Energy partitioning was affected by basal metabolism (HeE) which was similar in both dietary treatments (p> 0.05) but the heat increment of feeding (HiE) was higher with T1 than T2 (p<0.05), whereas retained energy (RE) increased in T2 compared to T1 (p<0.05). In summary, exogenous phytase added to a plant protein-based diet decreased the negative effect of phytic acid, released phosphorus, and therefore improved weight gain.
Highlights
Shrimp mineral nutrition is of concern for feed producers for several reasons
The principal aim of this study was to evaluate the effect of β-propeller phytase FTEII from Pichia pastoris on energy partitioning and weight gain of L. vannamei juveniles using FTEII pretreatment on soybean meal (SBM) and canola meal included in a plant based-diet
Civera and Guillaume (1989) reported no adverse effects of phytic acid on Marsupenaeus japonicus and L. vannamei juveniles, using sodium phytate as a P source, contrasting with the results of the present study which found that L. vannamei juveniles fed on T2 had a 90% survival rate, phytate was poorly digested, and weight gain was reduced in the absence of phytase
Summary
Shrimp mineral nutrition is of concern for feed producers for several reasons. It was reported that phosphorus deficiency caused “molt death syndrome” or some peak of mortality at molt in L. stylirostris juveniles raised in floating cages where shrimp retrieved Ca2+ but not Phosphorus at a concentration of 0.04 mg L-1 (Aquacop, 1983; Aquacop, 2013). These are some of the reasons why special attention was given to formulate feeds when phosphorus content would be in a bioavailable form in plant protein feedstuffs. No clear effect of exogenous phytase in the presence of phytate-containing ingredients has been shown in L. vannamei
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