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中华绒螯蟹幼蟹维生素C营养需求研究

, PP. 130-136

Keywords: 中华绒螯蟹幼蟹,维生素C,营养需求,抗逆性

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Abstract:

在每100g等氮、等能纯化饲料中分别添加0,100,200,400,800,1000mg维生素C(Vc)多聚磷酸酯(LAPP),用这样配制成的试验饲料饲喂已淡化5d的河蟹大眼幼体及后续幼蟹25d,探讨Vc对大眼幼体和幼蟹生长、存活、蜕壳频率及抗逆性的影响,同时探明幼蟹对Vc的适宜需求量,结果表明,饲料Vc添加量为100~400mg/100g时,可以保证幼蟹正常生长、存活和蜕皮,尤其以投喂添加Vc200mg/100g(C2组)和400mg/100g(C3组)饲料的Ⅲ期幼蟹增重率、存活率和平均蜕皮频率较高,其中C2组(上述各指标值)分别为516.18%,62.83%,2.58,C3组分别为458.89%,66.17%,2.61;饲料中缺少Vc时(如C0组),Ⅲ期幼蟹的增重率、存活率和平均蜕皮频率最低,分别为265.31%,26.67%和2.26.饲料中Vc的添加量达到800mg/100g(C4)和1000mg/100g(C5)时,幼蟹的蜕皮反而受到抑制,平均蜕皮频率降低,蜕皮周期延长,且存活率降低,到Ⅲ期幼蟹的增重率、存活率和平均蜕皮频率在C4组分别为355.7%,31.33%,2.39,在C5组分别为307.53%,28.56%,2.19.此外,各处理组幼蟹对抗逆性影响的试验表明,在一定的范围内,饲料中添加Vc能提高幼蟹的耐低氧能力和耐pH突变能力,而对耐盐度突变能力没有明显的影响.综合上述结果可以得出,为保持幼蟹良好生产性能,饲料中添加的Vc?

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