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Partial replacement of monocalcium phosphate with neutral phytase in diets for grass carp, C tenopharyngodon idellus
Author(s) -
Liu L. W.,
Luo Y. L.,
Hou H. L.,
Pan J.,
Zhang W.
Publication year - 2013
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12021
Subject(s) - monocalcium phosphate , phytase , grass carp , biology , zoology , feed conversion ratio , weight gain , medicine , digestive enzyme , alkaline phosphatase , endocrinology , protein efficiency ratio , amylase , phosphorus , carp , food science , biochemistry , enzyme , fish meal , body weight , fish <actinopterygii> , fishery , chemistry , organic chemistry
Summary A 9‐week experiment was designed to study the effects of partial replacement of monocalcium phosphate ( MCP ) with neutral phytase on growth, body compositions, serum biochemical statuses and intestinal digestive enzyme activities of grass carp, C tenopharyngodon idellus . The control diet (designated as P 2.0) was prepared with 2.0% MCP but without phytase. The three other diets (designated as PP 1.5, PP 1.0 and PP 0.5, respectively) were supplemented with 1.5, 1.0 and 0.5% MCP , respectively, along with 500 FTU of neutral phytase kg −1 diet in each. After a 9‐week feeding trial, fish (initial body weight: 43.44 ± 2.37 g) fed with PP 1.5 and PP 1.0 had no significant change in weight gain ( WG ), specific growth rate ( SGR ), protein efficiency rate ( PER ) or feed conversion ratio ( FCR ) compared with the control (P > 0.05) whereas fish fed with PP 0.5 showed significantly lower growth performance in the above parameters. The crude lipid content in whole body or muscle of the fish fed with PP 1.5 was significantly lower than the control while significantly higher in fish fed with PP 0.5 (P < 0.05), whereas no obvious change was observed in the fish fed with PP 1.0. For serum indices, higher serum alkaline phosphatase ( A lkp), phosphorus (P) and calcium (Ca) contents were observed in fish fed with phytase‐supplemented diets in comparison with the control. In addition, dietary phytase supplementation increased amylase activity and decreased lipase activity in both foregut and hindgut. The present study suggests that dietary MCP can be reduced when neutral phytase is added to the grass carp diet, and that the maximum MCP reduction level can be up to 1% when neutral phytase is supplemented at 500 FTU kg −1 diet.