摘要
Grain distillers dried yeast (GDDY) is a single-cell protein obtained as a co-product during the production of fuel ethanol that may have potential as a protein replacement for rainbow trout. The goal of this study was to examine the suitability of GDDY as a replacement for fish meal on a digestible protein basis in rainbow trout diets. An in-vivo digestibility study was performed to determine the nutrient availability of GDDY. Subsequently, a control diet containing 42% digestible protein and 20% lipid was formulated to replace fish meal protein with GDDY protein at eight different levels (0, 25, 37.5, 50, 62.5, 75, 87.5, and 100%). Diets were fed to juvenile rainbow trout stocked into four replicate tanks per dietary treatment (30 fish/tank) and fed twice daily for nine weeks. High GDDY inclusion rates significantly altered rainbow trout growth and feed conversion but not feed intake. There were no significant differences in production performance in fish fed the 25% GDDY and 37.5% GDDY diets when compared to fish fed the control diet, but further dietary fish meal replacement generally decreased fish performance. Further research is warranted to determine why fish performance decreased with higher inclusion levels of GDDY in spite of similar feed intake among levels.
摘要译文
谷物酿酒干酵母（GDDY）是生产燃料乙醇，可能有潜力作为蛋白质替代虹鳟鱼中获得作为副产物的单细胞蛋白。这项研究的目的是审查GDDY的适用性作为替代鱼粉对虹鳟饲料可消化蛋白的基础。一种生物体内进行消化率研究，以确定GDDY的养分利用度。随后，含有42％的可消化的蛋白质和20％脂肪对照饮食配制到与GDDY蛋白替代鱼粉蛋白质在8个不同级别（0，25，37.5，50％，62.5，75％，87.5，和100％）。日粮饲喂给幼年虹鳟鱼投放到每个饮食治疗（30尾/箱），并喂两次每日九个星期四个重复的坦克。高GDDY列入率显著改变虹鳟的生长和饲料转化率，但不能采食量。有鱼喂25％GDDY和37.5％GDDY日粮相比，喂养鱼类控制饮食的生产性能没有差异显著，但进一步的膳食鱼粉替代普遍降低鱼的性能。进一步的研究是必要的，以确定为什么鱼的表现，尽管水平之间相似的采食量与GDDY较高的包容水平下降。
Blake S. Hauptman[a][b]; Frederic T. Barrows[c]; Stephanie S. Block[d]; T. Gibson Gaylord[a]; John A. Paterson[b]; Steven D. Rawles[e]; Wendy.M. Sealey[a]. Evaluation of grain distillers dried yeast as a fish meal substitute in practical-type diets of juvenile rainbow trout, Oncorhynchus mykiss[J]. Aquaculture, 2014,432: 7–14