Efficacy of inorganic and chelated trace minerals (Cu, Zn and Mn) premix sources in Pacific white shrimp, Litopenaeus vannamei (Boone) fed plant protein based diets

摘要

The present experiment was conducted to evaluate the efficacy of trace minerals (Cu, Zn and Mn) premixes from inorganic and chelated (chelated to 2-hydroxy-4-methylthiobutanoic acid or hydroxy analog of methionine; Mintrex (TM)) sources, in juvenile Pacific white shrimp, (Litopenaeus vannamei) fed plant protein based practical diets. Eight experimental diets comprising a trace minerals (Cu, Zn andMn) deficient Basal control, and diets supplemented with the trace mineral premixes at four different levels of 2.5 (M-2.5), 5 (M-5), 7.5 (M-7.5) and 8.5 g/kg (M-8.5) fromchelated source and at three different levels of 5 (I-5), 8.5 (I-8.5) and 20 g/kg (I-20) frominorganic source were formulated. Eleven numbers of juvenile shrimp averaging 0.6 +/- 0.01 g (mean +/- SD) were fed one of the eight experimental diets in triplicate groups for 8 weeks. At the end of the feeding trial, shrimp fed M-2.5 and I-8.5 diets exhibited the similar final weight (FW) and weight gain (WG) (P b 0.05). Performance for Cu and Zn content in the hepatopancreas tissues and whole body showed equal efficiency of M-5 compared to I-8.5 diet (P b 0.05). Whereas, nonspecific enzyme, Cu-Zn super oxide dismutase (Cu-Zn SOD) from the serum and hepatopancreas tissue was recorded to be peaked for the group of shrimp fed M-5 diet. Moreover, plasma protein and glucose levels were recorded to be similar between the groups of shrimp fed M-2.5 and I-20 diets (P b 0.05). Therefore, the present experiment demonstrated, a higher efficiency of chelated over inorganic source of trace mineral premix in Pacific white shrimp, (L. vannamei) fed plant protein based diets.