Response of rainbow trout (Oncorhynchus mykiss) growing from 50 to 200 g to supplements of dibasic sodium phosphate in a semipurified diet
Response of rainbow trout (Oncorhynchus mykiss) growing from 50 to 200 g to supplements of dibasic sodium phosphate in a semipurified diet
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DOI：
10.1093/jn/126.1.324
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发表时间：
1996-01-01
影响因子：
4.2
通讯作者：
Rodehutscord, M
中科院分区：
文献类型：
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作者：
Rodehutscord, M
研究了提高饲料磷浓度对虹鳟鱼生长、摄食量、饲料转化率、增重组成和血浆中无机磷浓度的影响。12组共20尾鲑鱼，初始体重53+/-0.6g/尾，饲喂半纯饲料，每公斤干物质含19.6MJ可消化能。用磷酸二钠代替无机粘结剂共11个等级，可获得1.03~10.96g/kg干物质的12个磷素水平。用指数函数描述了在53d内测定的鲑鱼对饲料磷浓度增加的非线性响应。采食量、生长率、饲料转化率以及血浆无机磷浓度均随日粮磷水平的增加而增加。增重中磷、钙、镁、钾的浓度随日粮磷水平的增加而增加，而脂肪和能量的浓度随日粮磷水平的增加而降低。体重增加时蛋白质和钠的浓度不受影响。需要不同浓度的饲料磷才能达到所需性状所确定的平台值的95%。在生长速率和磷沉降量方面，所需磷浓度分别为3.7g/kg干物质和5.6g/kg干物质。然而，当饲料浓度为2.5g/kg干物质时，饲料磷的利用率最高(88%)。在最大磷沉降量(5.6g/kg干物质)的饲料磷浓度下，磷利用率约为60%。鲑鱼完全可以获得来自磷酸二钠的补充磷，在制定建议时必须考虑这一点。在此基础上，建议鲑鱼饲料中添加0.25g有效磷/MJ消化能。
Effects of increasing dietary concentrations of phosphorus on growth, feed intake, feed conversion, composition of gain and concentration of inorganic phosphate in plasma were studied in rainbow trout. Twelve groups of 20 trout initially weighing 53 +/- 0.6 g/fish were fed semipurified diets containing 19.6 MJ digestible energy per kilogram of dry matter. Twelve levels of phosphorus ranging from 1.03 to 10.96 g/kg dry matter were achieved by replacing inorganic binder with dibasic sodium phosphate in 11 graded levels. Nonlinear responses of trout to increasing dietary phosphorus concentration determined over 53 d were described using exponential functions. Feed intake, growth rate and feed conversion ratio as well as plasma inorganic phosphate concentration increased with increasing dietary phosphorus concentration. The concentrations of phosphorus, calcium, magnesium and potassium in weight gain increased, whereas concentrations of lipids and energy in weight gain decreased with increasing dietary phosphorus concentration. Concentrations of protein and sodium in weight gain were unaffected. Different concentrations of dietary phosphorus were required for achieving 95% of the plateau value determined for desired traits. In growth rate and phosphorus deposition, the required phosphorus concentrations were 3.7 and 5.6 g/kg dry matter, respectively. However, dietary phosphorus was utilized most efficiently (88%) at a dietary concentration of 2.5 g/kg dry matter. At the dietary phosphorus concentration that resulted in maximum phosphorus deposition (5.6 g/kg dry matter), phosphorus utilization was about 60%. Supplemental phosphorus from dibasic sodium phosphate was completely available to trout which must be considered in formulating recommendations. Based on this work, 0.25 g available phosphorus/MJ digestible energy is recommended for trout diets.