七种不同结构糖源对凡纳滨对虾三大营养物质代谢的影响

本实验研究了不同结构糖源饲料对初始体质量为(0.14±0.01)g的凡纳滨对虾生长、体组成及相关代谢的影响。实验共设7个处理,基础饲料中分别添加7种结构不同的糖源:葡萄糖、果糖、葡萄糖+果糖(1∶1)、蔗糖、麦芽糖、玉米淀粉和糊精,添加水平为20%。每处理设3个平行,每个平行放50尾虾,实验期56 d。结果表明,实验饲料对凡纳滨对虾的特定生长率和蛋白质效率有显著影响,呈现多糖蔗糖其他,其中葡萄糖组最低;实验饲料对凡纳滨对虾的全虾水分、灰分、蛋白质无显著影响,但对脂肪、肝糖原、肌糖原的影响显著。不同结构的糖源饲料对糖代谢相关酶及产物产生显著影响,对脂肪和蛋白代谢酶及产物影响不显著。

Effects of seven kinds of carbohydrate structure on the metabolism of Litopenaeus vannamei

Litopenaeus vannamei (0.14 ±0.01) g average weight] were fed with seven diets for 56 d to observe the effects of different carbohydrates on the growth performance, body composition and related metabolism in triplicate tanks (50 shrimps/tank) connected to a natural seawater (29) recirculating system. Seven formulated diets all contained about 20% carbohydrate content with different carbohydrate sources: glucose, fructose, glucose+fructose (1:1 weight ratio), sucrose, maltose, cornstarch and dextrin. Different carbohydrate sources had significant influence on the growth performance of shrimp when other requirements were met. The results showed that the shrimp fed polysaccharide are better than sucrose and others on the SGR and PER. And there was the lowest SGR and PER in glucose group. Different carbohydrate sources had no significant influence on the crude protein, moisture and ash of body, but had influence on the crude fat and glycogen of shrimp. Meanwhile, glycometabolism instead of fat and protein metabolism was affected by different carbohydrate sources in L. vannamei.