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首页> 外文期刊>Aquaculture Research >The effects of varying dietary protein level on growth, feed conversion, body composition and apparent digestibility coefficient of juvenile mangrove red snapper, Lutjanus argentimaculatus (Forsskal 1775).
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The effects of varying dietary protein level on growth, feed conversion, body composition and apparent digestibility coefficient of juvenile mangrove red snapper, Lutjanus argentimaculatus (Forsskal 1775).

机译：日粮蛋白质水平的变化对幼年红树林红鲷鱼Lutjanus argentimaculatus（Forsskal 1775）的生长，饲料转化，身体组成和表观消化系数的影响。

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摘要

The effects of several dietary protein levels on the growth, feed conversion, body composition and diet digestibility of juvenile Lutjanus argentimaculatus (body weight 12.3 g) were examined. Seven isolipidic (7.4%) diets were formulated to contain graded levels of protein (28-58%) with dietary energy ranging from 19.7 to 21.5 kJ g--1. Diets were distributed to triplicate groups of fish thrice a day at ration of 2% body weight for 90 days. Growth, feed conversion, protein utilization and digestibility of nutrients increased with increasing dietary protein level up to 43%, after which no significant improvement was observed. Digestibility of dry matter and energy showed a concomitant increase with the reduction in dietary wheat meal, attaining maximal values with high protein diets. No significant differences were detected in moisture, protein, lipid and ash content of whole fish or body organs as dietary protein increased. The mesenteric fat, hepato- and viscerosomatic indices decreased with increasing protein level. The cholesterol, triglycerides and haematocrit values were similar among treatments, except that high levels of plasma lipids were recorded above 43% protein diet. The use of a practical diet containing 43% protein is appropriate for the growth of L. argentimaculatus juveniles under the experimental conditions of the present study
机译：研究了几种饮食蛋白质水平对少年侧柏（Lutjanus argentimaculatus）（体重12.3 g）的生长，饲料转化，身体组成和饮食消化率的影响。配制了七个等脂饮食（7.4％），其中蛋白质的分级水平为（28-58％），饮食能量为19.7至21.5 kJ g -1 。每天以3％的比例将鱼的饲料重复三次，剂量为2％体重，持续90天。随着日粮蛋白质水平增加至43％，其生长，饲料转化率，蛋白质利用率和养分消化率均增加，此后未见明显改善。干物质和能量的消化率显示随着膳食小麦粉的减少而增加，在高蛋白饮食中达到最大值。随着饮食蛋白质的增加，整个鱼类或身体器官的水分，蛋白质，脂质和灰分含量均未发现显着差异。肠系膜脂肪，肝和内脏指数随蛋白质水平的升高而降低。治疗之间的胆固醇，甘油三酸酯和血细胞比容值相似，不同之处在于，记录到蛋白质饮食中43％以上的血浆脂质水平很高。在本研究的实验条件下，使用含有43％蛋白质的实用饮食适合argentimaculatus幼鱼的生长。

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