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首页> 外文期刊>Aquaculture International >Effects of dietary protein levels on growth performance and haemato-immunological parameters of juvenile genetically improved farmed tilapia (GIFT), Oreochromis niloticus
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Effects of dietary protein levels on growth performance and haemato-immunological parameters of juvenile genetically improved farmed tilapia (GIFT), Oreochromis niloticus

机译：日粮蛋白质水平对尼罗罗非鱼（Oreochromis niloticus）少年基因改良养殖罗非鱼（GIFT）生长性能和血液免疫学参数的影响

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摘要

This study evaluated the effect of dietary protein level on growth performance and haemato-immunological parameters of juvenile genetically improved farm tilapia, Oreochromis niloticus, fed five iso-caloric diets of dietary protein levels 25-45 %, formulated using white fish, casein, gelatine, soybean, cottonseed and rapeseed meals as protein sources. The diets influenced the significant increase in final weight, condition factor and whole body lipid composition (P 0.05). Conversely, the 25 % protein diet resulted in a significantly (P 0.05) lower weight gain and higher feed conversion ratio than the 30-45 % protein diets. Protein efficiency ratio and protein retention efficiency of the fish significantly reduced as dietary protein level increased (P 0.05). Meanwhile, hepatosomatic index increased with dietary protein. Haemato-immunological parameters, white blood cell, red blood cell, immune globulin M, superoxide dismutase and lysozyme activity, were not significantly affected by the dietary protein levels (P > 0.05). Quadratic regression model, y = -0.493x (2) + 41.03x + 267.3, informed that 41.6 % dietary protein supported maximum growth of tilapia juvenile. Fish fed 35 % protein diet had a similar growth performance, but better protein utilization than the 40 % group. These results demonstrated possibility of reducing protein level in commercial feeds, thus lowering feed costs .
机译：这项研究评估了日粮蛋白质水平对少年基因改良农用罗非鱼（Oreochromis niloticus）的生长性能和血液免疫学参数的影响，该日粮饲喂了5种日热量水平为25-45％的等热量日粮，采用白鱼，酪蛋白，明胶配制，大豆，棉籽和油菜籽粉作为蛋白质来源。饮食影响最终体重，条件因子和全身脂质组成的显着增加（P <0.05）。相反，与30-45％的蛋白质日粮相比，25％的蛋白质日粮导致体重增加显着（P <0.05）和较高的饲料转化率。鱼的蛋白质效率比和蛋白质保留效率随着日粮蛋白质水平的增加而显着降低（P <0.05）。同时，肝体指数随饮食蛋白质的增加而增加。饮食蛋白水平对血液免疫学参数，白细胞，红细胞，免疫球蛋白M，超氧化物歧化酶和溶菌酶活性没有显着影响（P> 0.05）。二次回归模型y = -0.493x（2）+ 41.03x + 267.3，表明41.6％的饮食蛋白质支持罗非鱼幼鱼的最大生长。饲喂蛋白质含量为35％的鱼的生长性能相似，但蛋白质利用率高于40％组。这些结果证明降低商业饲料中蛋白质水平的可能性，从而降低了饲料成本。

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