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研究了三个蛋白水平(22%、25%、28%)和五个L-肉碱水平(0、200、400、600、800mg/kg)下尼罗罗非鱼生长和饲料利用率。结果表明,随着饲料中蛋白水平的提高,罗非鱼幼鱼的终体重、增重率(WGR)和特定生长率(SGR)呈上升趋势,而饲料系数(FCR)和蛋白质效率(PER)均随饲料蛋白水平的升高而显著下降(P<0.05);同等蛋白水平下,终体重、WGR和SGR均在L-肉碱添加量为200mg/kg时最高,不添加L-肉碱组最小;在添加400mg/kgL-肉碱时FCR最小,而PER最大,与不添加L-肉碱组比较,差异均显著(P<0.05)。说明饲料中蛋白含量和L-肉碱添加量能显著影响罗非鱼幼鱼的生长和饲料利用,而外源性L-肉碱可明显促进罗非鱼生长,提高饲料转化效率。
Nile tilapia growth and feed utilization were studied at three protein levels (22%, 25%, 28%) and five L-carnitine levels (0, 200, 400, 600, 800 mg / kg) The results showed that with the increase of dietary protein levels, the final body weight, WGR and SGR of juvenile tilapia showed an upward trend while the feed efficiency (FCR) and protein efficiency (PER) (P <0.05). At the same protein level, the final body weight, WGR and SGR were the highest when L-carnitine was added at 200mg / kg, while the L-carnitine group Min; FCR was the lowest and PER was the highest when 400 mg / kg L-carnitine was added, compared with no L-carnitine group (P <0.05). The result showed that protein content and L-carnitine addition could significantly affect the growth and feed utilization of juvenile tilapia, while exogenous L-carnitine could significantly promote the growth of tilapia and improve feed conversion efficiency.