Dietary Lipid Requirements of Blunt Snout Bream (Megalobrama amblycephala) in Juvenile and Premature Stages

YAO Linjie; YE Yuantu; CAI Chunfang; ZHANG Ping; XU Fan; LIU Meng; LIU Hanchao; DONG Jiaojiao; CHEN Kequan; HUANG Yuwei

doi:10.3969/j.issn.1006-267x.2014.12.020

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 12: 3698 - 3706

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.12.020

Aquaculture Nutrition

Dietary Lipid Requirements of Blunt Snout Bream (Megalobrama amblycephala) in Juvenile and Premature Stages

YAO Linjie ,
YE Yuantu ,
CAI Chunfang ,
ZHANG Ping ,
XU Fan ,
LIU Meng ,
LIU Hanchao ,
DONG Jiaojiao ,
CHEN Kequan ,
HUANG Yuwei

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1. Key Laboratory of Aquatic Animal Nutrition in Jiangsu Province, School of Biology & Basic Medical Sciences, Soochow University, Suzhou 215123, China;
2. Bunge (Nanjing) Agri-Livestock Co. Ltd., Nanjing 211200, China

Received date: 2014-06-27

Online published: 2014-12-05

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Abstract

This experiment was to estimate the dietary lipid requirements of blunt snout bream (Megalobrama amblycephala) in two growth stages (juvenile and premature stages) under the same formula system. Six semipurified diets were formulated, casein and imported fish meal were used as protein source, and soybean oil and soybean lecithin were used as lipid source. The experimental diets were designed under the same protein content (crude protein content was 30%) condition, and contained a total of 6 gradient dietary lipid levels such as 3.06%, 4.38%, 5.89%, 7.45%, 8.78% and 10.13% (measrued values), respectively. Juvenile and premature stage trials used blunt snout bream with the initial average body weight of (34.98±0.47) g/fish and (102.05±2.31) g/fish as experiment animals, respectively. The fish in the juvenile and premature stage trials were fed the experimental diets with different lipid levels in pond cage for 85 and 56 days, respectively. Under the same growth stage, each diet as a group, and each group had 4 replicates with 20 fish in each replicate. The results showed as follows: with the dietary lipid level increasing, the weight gain rate (WGR) and protein efficiency ratio (PER) of blunt snout bream in two growth stages were firstly increased and then decreased, and both of them had the highest WGR and PER when dietary lipid level was 8.78%, while the feed conversion ratio (FCR) was firstly decreased and then increased, and both of them had the lowest FCR when dietary lipid level was 8.78%. Under the same formula system, the crude protein content in whole-body of blunt snout bream showed juvenile stage>premature stage, while the crude lipid content showed premature stage>juvenile stage. With the dietary lipid level increasing, the crude protein content in whole-body of blunt snout bream in two growth stages showed a trend of firstly increased and then decreased, while the crude lipid content was continually increased, and there was a position correlation between dietary lipid level and crude lipid content in whole-body. WGR, PER and FCR are used as evaluating indicators for regression analysis, the results show that the dietary lipid requirements of blunt snout bream in juvenile and premature stages are 8.18% to 8.89% and 9.03% to 9.47%, respectively.

Key words： blunt snout bream; growth stage; lipid; requirement

Cite this article

YAO Linjie , YE Yuantu , CAI Chunfang , ZHANG Ping , XU Fan , LIU Meng , LIU Hanchao , DONG Jiaojiao , CHEN Kequan , HUANG Yuwei . Dietary Lipid Requirements of Blunt Snout Bream (Megalobrama amblycephala) in Juvenile and Premature Stages[J]. Chinese Journal of Animal Nutrition, 2014 , 26(12) : 3698 -3706 . DOI: 10.3969/j.issn.1006-267x.2014.12.020

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