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The present study was conducted to investigate a supplemental effect of magnesium hydrogen phosphate (MHP, MgHPO4) as an alternative phosphorus (P) source on growth and feed utilization of juvenile far eastern catfish (Silurus asotus) in comparison with three conventional P additives (monocalcium phosphate (MCP), dicalcium phosphate (DCP) and tricalcium phosphate [TCP]) as positive controls. A basal diet as a negative control was prepared without P supplementation and four supplemental P sources were added at the level of 2%. Five groups of 450 fish having mean body weight of 11.3 g following 24 h fasting after three week adaptation period were randomly distributed into each of 15 tanks (30 fish/tank). Fish were hand-fed to apparent satiety twice a day for 8 weeks. Fish fed MHP had weight gain (WG), protein efficiency ratio and specific growth rate comparable to those fed MCP. Fish fed MHP and MCP had feed efficiency (FE) significantly higher (p&lt;0.05) than those fed DCP. Fish groups fed control and TCP showed the lower FE than the other groups which was significantly different (p&lt;0.05) from those of fish fed the other diets. Survival rate was not significantly different (p&gt;0.05) among treatments. Fish fed control had the lowest hematocrit, which was significantly different (p&lt;0.05) from that of fish fed MHP. Fish fed MCP and MHP had plasma P higher (p&lt;0.05) than fish fed the other diets. Relative efficiencies of MCP, DCP and TCP to MHP were found to be 100.5 and 101.3%, 92.0 and 91.6%, and 79.1 and 80.9% for WG and FE, respectively. P availability was determined to be 88.1%, 75.2%, 8.7%, and 90.9% for MCP, DCP, TCP, and MHP, respectively. Consequently, MHP recovered from wastewater stream showed that as an alternative P source its performance was comparative with MCP on growth and feed utilization of juvenile far eastern catfish.

asian-australasian journal of animal sciences

Effects of Dietary Supplementation of Magnesium Hydrogen Phosphate (MgHPO&lt;sub&gt;4&lt;/sub&gt;) as an Alternative Phosphorus Source on Growth and Feed Utilization of Juvenile Far Eastern Catfish (&lt;i&gt;Silurus asotus&lt;/i&gt;)