Apparent digestibility of juveniles of matrinxã Brycon amazonicus fed diets with different protein levels

ABSTRACT. The objective of the present study was to determine the apparent digestibility of juveniles of matrinxã Brycon amazonicus fed diets with different levels of protein. The experimental design was completely randomized, where the treatments consisted of four levels of protein in the diets (28, 32, 36 and 40%) and five replicates (water boxes) with 10 juveniles of matrinxã each. Diets were offered four times a day, and feces were collected twice a week, along 28 days, for digestibility analysis. Data collected were subjected to polynomial regression at 5% significance. Differences (p 0.05) in the digestibility of % ether extract. Digestibility of N, P, Ca, Mg, Cu and Zn presented linear positive (p摘要。本研究旨在探究饲喂不同蛋白质水平日粮的玛特林沙（matrinxã，学名Brycon amazonicus）幼鱼的表观消化率（apparent digestibility）。本实验采用完全随机设计，实验组设置4个日粮蛋白质水平梯度（28%、32%、36%及40%），每组配备5个重复水族箱，每个水族箱放养10尾玛特林沙幼鱼。每日投喂日粮4次，在为期28天的实验周期内每周收集两次粪便，用于消化率分析。对采集的数据以5%显著性水平开展多项式回归分析。乙醚浸出物（ether extract）的消化率存在显著差异（p 0.05）；氮（N）、磷（P）、钙（Ca）、镁（Mg）、铜（Cu）及锌（Zn）的消化率呈线性正相关（p