Molecular Nutrition

Effects of Peptides Hydrolyzed from Poultry By-Products on Growth Performance, Digestive Indices and Non-Specific Immune Indices of Litopenaeus vannamei

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  • 1. Ocean College of Hebei Agricultural University, Qinhuangdao 066000, China;
    2. Gaotang First Middle School in Shangdong Province, Liaocheng 252000, China

Received date: 2017-08-10

  Online published: 2018-02-02

Abstract

In this study, we evaluated the growth performance, digestive indices and non-specific immune indices of Litopenaeus vannamei to study the feasibility of peptides hydrolyzed from poultry by-products (PHFP) as a protein source for partial replacement of fish meal (FM) in the diet of Litopenaeus vannamei. Five experimental diets were prepared to replace 0 (control), 2%, 4%, 6% and 8% FM of basal diet by premixed PHFP (adding coated methionine in the PHFP to reach methionine content in line with domestic FM), respectively. A total of 900 Litopenaeus vannamei with the average body weight of (0.31±0.01) g were randomly divided into 5 groups with 3 replicates per group and 60 shrimps per replicate. The indoor feeding experiment lasted for 6 weeks. The results showed as follows:PHFP could replace 2% to 6% of FM without causing a significant reduction in the weight gain rate, specific growth rate, protein efficiency ratio and feed conversion ratio of shrimps (P>0.05). Compared with the control group, the crude fat content of whole body was significantly decreased (P<0.05) and the ash content of whole body was significantly increased (P<0.05) when the replacement level of FM with PHFP was over 2%. When the replacement level of FM with PHFP was 2%, the lipase (LPS) activity in hepatopancreas was highest among the groups, while the contents of glucose (GLU) and triglycerides (TG) in plasma were significantly decreased (P<0.05) and the activity of lysozyme (LZM) in plasma was significantly increased compared with control group (P<0.05). When the replacement level of FM with PHFP was over 2%, the peroxidase (POD) activity in plasma was significantly decreased compared with control group (P<0.05). There were no significant differences in the apparent digestibility of crude protein and crude fat, the activity of LZM, POD and total antioxidant capacity (T-AOC) in hepatopancreas (P>0.05). It follows that in this experiment condition, based on the growth performance and took into account digestive indices and non-specific immune indices, optimal replacement level of FM with PHFP in the diet for Litopenaeus vannamei is 2%.

Cite this article

LU Jingjing, GUO Ran, XIA Hui, XIE Wei, WANG Meixue, YANG Pinxian, LI Na . Effects of Peptides Hydrolyzed from Poultry By-Products on Growth Performance, Digestive Indices and Non-Specific Immune Indices of Litopenaeus vannamei[J]. Chinese Journal of Animal Nutrition, 2018 , 30(2) : 797 -806 . DOI: 10.3969/j.issn.1006-267x.2018.02.046

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