饲料蛋白质和脂肪水平对赤眼鳟生长和鱼体营养成分的影响

采用3×3因子试验设计,配制9种试验饲料,研究饲料不同蛋白质水平(31%、37%和43%)和脂肪水平(3.5%、5.5%、7.5%)对平均体重为5.49 g赤眼鳟(Squaliobarbus curriculus)鱼种生长和鱼体组成的影响。实验选取赤眼鳟鱼种810尾,随机分成9组,每组2个重复,饲养期6周。结果显示:饲料蛋白质和脂肪的交互作用对赤眼鳟的特定生长率有显著影响(P<0.05),饲料蛋白质水平对饲料系数影响显著(P<0.05),当饲料蛋白质水平为37%、脂肪水平为3.5%时赤眼鳟特定生长率最大,饲料系数最低。随着特定生长率的升高,赤眼鳟的肥满度和肌肉蛋白质的含量升高;赤眼鳟肌肉和肝脏脂肪含量均随着饲料中可消化能的增加而增加。

Effects of dietary protein and lipid levels on growth and body composition of Squaliobarbus curriculus

A 3×3 factorial feeding trial was designed to determine the effects of dietary protein and lipid on growth and body composition of Squaliobarbus curriculus.810 S.curriculus(averag 5.49 g in initial body weight) were randomly divided into 9 groups and were fed with test diets containing different protein levels(31%,37% and 43%) and lipid levels(3.5%,5.5% and 7.5%) for 6 weeks.The results showed that the interaction of protein and lipid in feed had significant difference on specified growth rate(SGR) of S.curriculus(P<0.05) and feed conversion ratio(FCR) was significantly influenced by the dietary protein level(P<0.05).The group containing protein level(37%) and lipid level(3.5%) showed the highest SGR and the lowest FCR.The body condition factor and the muscle protein content of S.curriculus increased with the increase of SGR.Meanwhile,lipid content of the muscle and the liver increased with the increasing of the dietary digestible energy.