Effects of dietary phosphorus and lipid levels on utilization and excretion of phosphorus and nitrogen by rainbow trout (Oncorhynchus mykiss).: 2.: Production-scale study
Effects of dietary phosphorus and lipid levels on utilization and excretion of phosphorus and nitrogen by rainbow trout (Oncorhynchus mykiss).: 2.: Production-scale study
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DOI：
10.1046/j.1365-2095.2002.00217.x
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发表时间：
2002-12-01
影响因子：
3.5
通讯作者：
Hardy, RW
中科院分区：
文献类型：
--
作者：
Green, JA;Brannon, EL;Hardy, RW
在为期8周的生产规模试验中，在一个商业鳟鱼养殖场，饲料中的脂肪水平和磷水平对虹鳟鱼（初始平均体重99 g）的磷（P）和氮（N）利用的影响进行了评估。将低磷、高脂实验饲料（457 g蛋白质、315 g脂质、9.1 g P kg（-1）干饲料）与常用的商业饲料（484 g蛋白质、173 g脂质、13.6 g P kg（-1）干饲料）进行比较。P和N的预算构建使用的数据从生产规模的实验和消化率数据的两种饮食。此外，正磷酸盐和氨氮废物进行了测量，在一个24小时内的流出物。相对于商业饲料，实验饲料导致显著增加的饲料效率比，氮保留和磷保留，并大大减少溶解，固体和总磷废物（g kg（-1）干饲料）。虽然从实验饮食的N保留率较高，这是由于较高的N（蛋白质）消化率的实验饮食。实验日粮产生的固体氮废物（g kg（-1）干饲料）显著较低，但溶解氮废物（g kg（-1）干饲料）相对于商业日粮没有显著差异。试验组鱼的平均出水正磷酸盐产量（mg/d（-1）kg（-1）鱼）显著低于商业饲料组（P < 0.05），但出水氨氮产量（mg/d（-1）kg（-1）鱼）不受饲料处理的显著影响。
In a 8-week production-scale experiment at a commercial trout farm, the effects of dietary lipid level and phosphorus level on phosphorus (P) and nitrogen ( N) utilization of rainbow trout ( initial mean weight 99 g) were assessed. A low-phosphorus, high-lipid experimental diet ( 457 g protein, 315 g lipid, 9.1 g P kg(-1) dry diet) was compared with a commonly used commercial diet (484 g protein, 173 g lipid, 13.6 g P kg(-1) dry diet). P and N budgets were constructed using data from the production-scale experiment and digestibility data for the two diets. In addition, orthophosphate and ammonia-N waste were measured in effluent over one 24-h period. Relative to the commercial diet, the experimental diet resulted in significantly increased feed efficiency ratio, N retention and P retention, and substantially reduced dissolved, solid and total P waste (g kg(-1) dry feed). Although N retention resulting from the experimental diet was higher, this was attributable to higher N ( protein) digestibility of the experimental diet. Solid N waste (g kg(-1) dry feed) resulting from the experimental diet was substantially lower, but dissolved N waste (g kg(-1) dry feed) was not significantly different relative to the commercial diet. Mean effluent orthophosphate production (mg day(-1) kg(-1) fish) of fish fed the experimental diet was substantially lower than that of fish fed the commercial diet (P < 0.05), but effluent ammonia-N production (mg day(-1) kg(-1) fish) was not significantly affected by dietary treatment.