Molecular Nutrition

Optimal Supplemental Level of Monocalcium Phosphate in Diets for Triploid Crucian Carp

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  • 1. College of Animal Science and Technology of Southwest University, Key Laboratory of Freshwater Reproduction and Development, Ministry of Education, Chongqing 400716, China;
    2. New Hope Animal Husbandry Technology Co., Ltd., Chengdu 610041, China

Received date: 2018-03-26

  Online published: 2018-10-20

Abstract

This experiment was conducted to study the optimal supplemental level of monocalcium phosphate (MCP) in diets for triploid crucian carp. Triploid crucian carps with an initial body weight of (40.00±0.34) g were randomly divided into 6 groups with 3 replicates per group and 20 fish per replicate. Six isonitrogenous and isoenergetic practical diets with different supplemental levels (1.0%, 1.5%, 2.0%, 2.5%, 3.0% and 3.5%) of MCP were fed to the 6 groups for 8 weeks, respectively. The results showed as follows:with the increase of dietary MCP supplemental level, the final average body weight and weight gain rate (WGR) were firstly increased and then decreased, while the feed conversion rate (FCR) was firstly decreased and then increased. The highest final average body weight and WGR appeared when MCP supplemental level was 2.5%, and the lowest FCR appeared when MCP supplemental level was 3.0%. With the increase of dietary MCP supplemental level, the ether extract content of whole body, muscle and liver was firstly decreased and then increased, and got minimum when MCP supplemental level was 2.5%, together with a maximum of crude protein content of whole body, and phosphorus content of whole body and vertebra in this MCP supplemental level. There was no significant difference in moisture content of whole body among different groups (P>0.05). When MCP supplemental level was 2.5%, the activities of intestinal trypsin, amylase and lipase, and serum superoxide dismutase (SOD) and alkaline phosphatase (AKP) gained the highest values, while the contents of serum triglyceride (TG) and liver malonaldehyde (MDA) reached the lowest values under this MCP supplemental level. Serum cholesterol (CHO) content had no significant difference among different groups (P>0.05). Serum phosphorus content was firstly increased with the increase of MCP supplementation level, and then tended to be stable. No significant difference was found in serum calcium content among different groups (P>0.05). Quadratic curve model and broken-line model analysis indicate that the optimal supplemental level of MCP in diets for triploid crucian carp is 2.55% to 2.71% with the WGR, FCR, whole body and vertebrae phosphorus content as evaluation indexes.

Cite this article

WANG Shuang, LUO Li, SHI Yaqing, TANG Yi, LI Zhanfu, LI Weilong, LUO Hao . Optimal Supplemental Level of Monocalcium Phosphate in Diets for Triploid Crucian Carp[J]. Chinese Journal of Animal Nutrition, 2018 , 30(10) : 3985 -3992 . DOI: 10.3969/j.issn.1006-267x.2018.10.023

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