Phosphorus Requirement of Bluntnose Black Bream

LIU Hanchao; YE Yuantu; CAI Chunfang; YAO Linjie; CHEN Kequan; HUANG Yuwei; GONG Zhi

doi:10.3969/j.issn.1006-267x.2014.03.034

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 3: 812 - 818

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.03.034

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Phosphorus Requirement of Bluntnose Black Bream

LIU Hanchao ,
YE Yuantu ,
CAI Chunfang ,
YAO Linjie ,
CHEN Kequan ,
HUANG Yuwei ,
GONG Zhi

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College of Preclinical Medicine and Biological Science, Soochow University, Suzhou 215123, China

Received date: 2013-09-24

Online published: 2014-03-04

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Abstract

In order to estimate the dietary phosphorus requirement of bluntnose black bream (Megalobrama amblycephala), the effects of dietary phosphorus level on growth performance, body composition and contents of phosphorus in different tissues of bluntnose black bream were studied. A total of 480 bluntnose black breams with an average initial body weight of 35 g were randomly divided into 6 groups with 4 replicates per group and 20 bluntnose black bream per replicate. The experiment lasted for 85 days. Using semi-purified diet, six experimental diets containing different phosphorus levels (3.8, 6.9, 10.1, 13.2, 16.4 and 19.5 g/kg) were formulated with Ca(H₂PO₄)₂ as the phosphorus source. The results showed as follows: 1) weight gain rate was significantly increased in experimental group with 13.2 g/kg phosphorus compared with that in the other groups (P<0.05); 2) the survival rate, contents of crude protein and ether extract in whole body were not significantly affected by dietary phosphorus level (P>0.05), and the ash content in experimental group with 3.8 g/kg phosphorus was significantly lower than that in other groups (P<0.05); 3) with dietary phosphorus level increasing, phosphorus content in whole body, vertebra, opercle and scale was significantly increased (P<0.05). Dietary phosphorus level had significant effects on phosphorus content in whole body, muscle, vertebra, opercle and scale (P<0.05). In conclusion, under the conditions of this experiment, not only growth performance, but also contents of phosphorus in whole body and tissues are affected by dietary phosphorus level. Quadratic model analysis results show that the optimum dietary phosphorus requirements for maximum growth of bluntnose black bream is 12.98~13.18 g/kg.

Key words： bluntnose black bream; phosphorus; requirement; growth

Cite this article

LIU Hanchao , YE Yuantu , CAI Chunfang , YAO Linjie , CHEN Kequan , HUANG Yuwei , GONG Zhi . Phosphorus Requirement of Bluntnose Black Bream[J]. Chinese Journal of Animal Nutrition, 2014 , 26(3) : 812 -818 . DOI: 10.3969/j.issn.1006-267x.2014.03.034

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