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Availability of phosphorus in various inorganic phosphorus sources in dietary of Hemibarbus maculatus Bleeker

ZHAO Chao-yang1,2,ZHOU Hong-qi2,XU Pao1,CHEN Jian-ming3,YE Jin-yun3,LI Hong-xia1(1.Freshwater Fisheries Research Center,Chinese Academy of Fishery Science,Wuxi 214081,China; 2.College of Aqua-life Science and Technology,Shanghai Fisheries University,Shanghai 200090,China; 3.Zhejiang Institute of Freshwater Fisheries,Huzhou 313001,China)  
By use of fish meal and soybean meal as protein source,added with monobasic calcium phosphates(MCP),dibasic calcium phosphates(DCP),tribasic calcium phosphates(TCP)as different inorganic source of phosphorus respectively to formulate experimental diets(Total P of 0.91%),each treatment with triplicate groups of Hemibarbus maculatus Bleeker(initial weight about 11 g) was fed to satiation for 8 weeks.A study was conducted to investigate the effects of different phosphorus resources on growth,ash,calcium and phosphorus content of whole body,vertebrae and scale of Hemibarbus maculates Bleeker.The results showed that the growth and feed efficiency of spotted steed were significantly affected by different inorganic sources of phosphorus(P0.05).Weight gain rate of MCP,DCP group were improved 24.86%,13.75% higer than that of TCP group respectively.Feed efficiency of MCP group was improved 15.47% higher than that of TCP group.Effects of different phosphorus sources on ash and phosphorus content in whole body,vertebrae,scale of Hemibarbus maculates Bleeker were significantly different except for calcium content.Ash and phosphorus content in whole body,vertebrae,scale of MCP group were the highest,higher than those of TCP group significantly.Apparent phosphorus digestibility of spotted steed was significantly affected by different inorganic source of phosphorus(P0.05),which in MCP group was the highest.Apparent phosphorus digestibility of MCP group and DCP group were improved 85.97%,42.90% more than that of TCP group respectively.From all above three criteria,it was suggested that MCP was the best dietary inorganic phosphorus source for Hemibarbus maculatus Bleeker,and DCP was also ideal dietary inorganic phosphorus source,but TCP was relatively inferior.
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