In this study, feeding experiment and subsequent digestibility trial were performed to investigate the utilization of extruded soybean meal (SBM) and corn gluten meal (CGM) as feed ingredients for juvenile rainbow trout. Plant ingredients have undergone extrusion at low temperature (100°C, LT) or high temperature (150°C, HT) for 30 s. Four isonitrogenous (44%, crude protein) and isolipidic (14%, crude lipid) diets were formulated. Control diet is fishmeal based while a combined (1:1) non‐extruded SBM and CGM for NE diet, LT SBM and LT CGM for LT diet and HT SBM and HT CGM for HT diet. Two hundred forty rainbow trout juveniles (7.8 g average body weight) were randomly divided into 12 rectangular 60 L glass aquaria and offered four different diets in triplicate. Fish were fed at satiation twice a day, six days a week for 12 weeks. Phosphorus in phytic acid level of extruded ingredients decreased through extrusion cooking. Final weight, weight gain, SGR and PER of fish fed HT diet were significantly (p < .05) higher than those fed with NE diet. Apparent digestibility coefficient for protein of LT and HT diets is significantly higher than of NE diet. The results of this study demonstrated that HT extruded SBM and CGM are suitable feed ingredients for rainbow trout diet without compromising fish growth, feed utilization and fish body composition.

中文翻译：

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大豆和玉米面筋组合膨化粕用作幼年虹鳟鱼，Oncorhynchus mykiss饲料的饲料原料

在这项研究中，进行了饲喂实验和随后的消化率试验，以研究利用膨化大豆粉（SBM）和玉米面筋粉（CGM）作为幼体虹鳟鱼的饲料成分。植物成分在低温（100°C，LT）或高温（150°C，HT）下经过30 s挤压。配制了四种等氮（44％，粗蛋白质）和等脂（14％，粗脂质）饮食。对照日粮以鱼粉为基础，NE日粮为联合（1：1）非挤压SBM和CGM，LT日粮为LT SBM和LT CGM，HT日粮为HT SBM和HT CGM。将240只虹鳟鱼幼体（平均体重7.8 g）随机分为12个60 L矩形玻璃水族箱，一式三份提供四种不同的饮食。每周两次，每周六天，每天两次饱食。通过挤压蒸煮，挤压成分中植酸中的磷含量降低。用HT饮食喂养的鱼的最终体重，体重增加，SGR和PER显着（p  <.05）高于那些以NE饮食喂养的人。LT和HT日粮的蛋白质表观消化系数显着高于NE日粮。这项研究的结果表明，高温膨化的SBM和CGM是虹鳟鱼饲料的合适饲料成分，而不会损害鱼的生长，饲料利用率和鱼体组成。