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首页> 外文期刊>Aquaculture Research >Growth, feed conversion, fillet proximate composition and resistance toEdwardsiella ictaluri of channel catfish, Ictalurus punctatus(Rafinesque), blue catfish, Ictalurus furcatus (Lesueur), and theirreciprocal F1 hybrids fed 25% and 45% protein diets
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Growth, feed conversion, fillet proximate composition and resistance toEdwardsiella ictaluri of channel catfish, Ictalurus punctatus(Rafinesque), blue catfish, Ictalurus furcatus (Lesueur), and theirreciprocal F1 hybrids fed 25% and 45% protein diets

机译：饲喂25％和45％的蛋白质日粮的cat鱼，马尾c（Ictalurus punctatus（Rafinesque），蓝cat鱼，Ictalurus furcatus（Lesueur）及其相互的F1杂种）的生长，饲料转化，鱼片临近组成以及对埃德华氏菌的抵抗力

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摘要

Juvenile channel catfish, Ictalurus punctatus (Rafinesque), blue catfish, I. furcatus (Lesueur), and their reciprocal Fl hybrids were fed practical diets containing 25% and 45% protein during a 10-week trial to determine the effects of genotype, dietary protein level and genotype X diet interactions on growth, feed conversion ratio (FCR), fillet proximate composition and resistance to the bacterium Edwardsiella ictaluri. Rankings of genotypes (best to worst) for absolute weight gain, percentage weight gain and FCR were: channel, channel female X blue male, blue, and blue female X channel male for the 25% protein diet; and channel, channel X blue, blue X channel, and blue for the 45% diet. Diet did not affect growth or FCR of channel catfish, but growth and FCR were better for blue catfish and both hybrids fed the 25% diet compared to those fed the 45% diet. Channel catfish additive genetic and maternal effects were favourable, and heterosis was negative for growth and FCR. After adjusting for effects of fish size, genotype had no effect on fillet composition. Fillet protein was higher for all genotypes, and fillet lipid was lower for blue catfish and hybrids fed the 45% diet than for fish fed the 25% diet. Genotype X diet interactions observed for growth, FCR and fillet lipid appeared to be a result of poor palatability of the 45% diet to blue catfish and hybrids. Survival (76-93%) and antibody levels (0.10-0.24 OD) after exposure to E. ictaluri at the end of the feeding trial were not affected by genotype or diet. Hybridization of blue catfish and channel catfish would not be an effective method for improving the traits measured for the fish strains and diets used in this study.
机译：在一项为期10周的试验中，对幼龄cat鱼，Ictalurus punctatus（Rafinesque），蓝cat鱼，I。furcatus（Lesueur）及其互反的Fl杂种饲喂了含有25％和45％蛋白质的实用饮食，以确定基因型，饮食的影响。蛋白质水平和基因型X饮食相互作用对生长，饲料转化率（FCR），鱼片附近成分以及对细菌爱德华氏菌的抵抗力。绝对体重增加，体重增加百分比和FCR的基因型排名（从最佳到最差）为：25％蛋白质饮食的通道，通道雌性X蓝色雄性，蓝色和蓝色雌性X通道雄性;和频道，频道X为蓝色，频道X为蓝色，频道为饮食的45％为蓝色。饮食不影响channel鱼的生长或FCR，但蓝cat鱼的生长和FCR更好，两种饲喂25％饲料的杂种均比饲喂45％饲料的杂种好。鱼的附加遗传和母体效应是有利的，杂种优势对生长和FCR不利。调整鱼类大小的影响后，基因型对鱼片组成没有影响。所有基因型的鱼片蛋白均较高，而饲喂45％日粮的蓝cat鱼和杂种的鱼片脂质低于饲喂25％日粮的鱼片。 X型基因型日粮相互作用的生长，FCR和鱼片脂质似乎是45％日粮对蓝cat鱼和杂种适口性差的结果。饲喂试验结束后，暴露于大肠杆菌中后存活率（76-93％）和抗体水平（0.10-0.24 OD）不受基因型或饮食的影响。蓝cat鱼和槽channel鱼的杂交不是改善本研究中所用鱼品系和日粮所测特性的有效方法。

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