科研之友
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摘要
We conducted a growth trial to study how dietary phosphorus (P) influenced utilization and excretion of P for juvenile yellow catfish. Four mathematical models describing different mechanisms of fish phosphorus metabolism were tested, and the best model was selected using Akaike information criterion to describe the relationships between dietary P-avail% and P wastes (dissolved or solid). A linear model showed that solid P waste increased with the increase in dietary total P. A logistic model with an asymptotic dissolved P waste value at 11 g/kg feed provided the best prediction on dissolved P waste by dietary P-avail%. The maximum discharge rate of dissolved P waste relative to dietary P concentration was found at P-avail% = 1.0 and the dissolved P waste of 5 g/kg feed. A Ricker's dome-shape model estimated that the proportion of dissolved P waste increased with dietary P-avail to the maximum value of 89 % at P-avail% = 1.24 and then started to decrease at P-avail% > 1.24. P excretion seemed to be mainly in the form of dissolved P when fish fed with the feed containing highly available P. Linear regression analysis showed that an increase in dietary P did not affect growth and feed conversion ratio, but resulted in a decrease in phosphorus retention rate and an increase in solid P waste in juvenile yellow catfish.
- 出版日期2016-2
- 单位华中农业大学
