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Phytase can reduce theneedfor monocalcium phosphate supplementation in soybean and rapeseed meal‐based diets of black sea bream, Acanthopagrus schlegelii (Bleeker, 1854)
Author(s) -
Lu Y.B.,
Xu S.D.,
Liu Y.T.,
Zhang T.,
Du H.F.,
Ai Q.H.
Publication year - 2016
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.13150
Subject(s) - monocalcium phosphate , phytase , biology , zoology , feed conversion ratio , weight gain , phosphorus , fish meal , meal , soybean meal , rapeseed , phosphate , protein efficiency ratio , composition (language) , fishery , body weight , food science , fish <actinopterygii> , ecology , biochemistry , chemistry , endocrinology , raw material , enzyme , linguistics , philosophy , organic chemistry
Summary A feeding trial was conducted to study the effect of partial replacement of dietary monocalcium phosphate ( MCP ) with phytase on growth performance, feed utilization and phosphorus discharge in black sea bream, Acanthopagrus schlegelii . In the feeding trial, the control diet (designated as P1.5) was prepared with 1.5% MCP but without phytase, and the three other diets (designated as PP 1.0, PP 0.5 and PP 0, respectively) were supplemented with 1.0%, 0.5% and 0% MCP , respectively, along with 200 mg (400 U) phytase/kg diet in each. Each diet was tested in triplicate tanks and fish were fed twice daily to satiation. After an 8‐week feeding trial in indoor flow‐through cylindrical fibreglass tanks (25 fish per tank, initial body weight: 11.5 ± 0.12 g), fish fed with PP 1.0 and PP 0.5 had no significant change in weight gain ( WG ), specific growth rate ( SGR ), protein efficiency rate ( PER ) or feed conversion ratio ( FCR ) compared to the control ( p > .05), whereas fish fed with PP 0 showed a significantly lower growth performance in the above parameters ( p < .05). The addition of phytase did not affect the body composition or muscle composition. The apparent digestibility coefficients ( ADC s) of crude protein and phosphorus increased when fish were fed diets in which MCP was replaced by phytase. Phosphorus discharge was also significantly reduced in fish fed diets in which MCP was replaced by phytase (10.2 ± 0.50 to 8.01 ± 0.47 g/kg weight gain). The present study suggests that dietary MCP can be reduced when phytase is added to the black sea bream diet, with a maximum MCP reduction level of up to 1% when phytase is supplemented at 200 mg (400 U)/kg diet. Thus, phytase in the diet of black sea bream is economically and ecologically beneficial.