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采用单因素实验设计方法, 以初始体重为20g左右的三疣梭子蟹(Portunus trituberculatus)幼蟹为实验对象, 胆固醇添加量为0.003%、0.3339%、0.655%、0.986%、1.303%和1.628%的实验饲料投喂8周, 研究其胆固醇需求量。结果表明, 饲料中添加0.003%—1.628%胆固醇对各处理组的存
活率无显著性影响(P>0.05)。随饲料胆固醇水平的上升, 三疣梭子蟹幼蟹的增重率呈先上升后下降的趋势, 当饲料胆固醇水平≥0.655%时, 三疣梭子蟹幼蟹的增重率呈下降趋势。折线模型表明, 饲料中胆固醇添加量为0.6%时, 三疣梭子蟹幼蟹的增重率、性腺指数和壳宽增加达到最高值。根据增重率折线模型结果, 作者认为三疣梭子蟹幼蟹饲料中添加0.6%左右胆固醇较为适宜 相似文献
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This study was conducted to evaluate the effects of dietary lipid sources on the growth performance and fatty acid composition of the swimming crab, P ortunus trituberculatus. Four isonitrogenous and isoenergetic experimental diets were formulated to contain four separate lipid sources, including fish, soybean, rapeseed, and linseed oils(FO, SO, RO, and LO, respectively). With three replicates of 18 crabs each for each diet, crabs(initial body weight, 17.00 ±0.09 g) were fed twice daily for 8 weeks. There were no significant differences among these groups in terms of weight gain, specific growth rate, and hepatosomatic index. However, the RO groups' survival rate was significantly lower than FO groups. The feed conversion and protein efficiency ratios of RO groups were poorer than other groups. The proximate compositions of whole body and hepatopancreas were significantly affected by these dietary treatments. Tissue fatty acid composition mainly reflected dietary fatty acid compositions. Crabs fed FO diets exhibited significantly higher arachidonic, eicosapentaenoic, and docosahexaenoic acid contents in muscle and hepatopancreas compared with VO crabs. Linoleic, oleic, and linolenic acids in muscle and hepatopancreas were the highest in the SO, RO, and LO groups, respectively. The present study suggested that SO and LO could substitute for FO in fishmeal-based diets for swimming crabs, without affecting growth performance and survival. 相似文献
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饲料脂肪水平对三疣梭子蟹(Portunus trituberculatus)幼蟹生长及体组成的影响 总被引：2，自引：1，他引：1
采用单因素试验设计方法, 进行了不同饲料脂肪水平对三疣梭子蟹(Portunus trituberculatus)幼蟹生长及体组成影响的研究。结果表明, 低饲料脂肪水平(1.8%)组的增重率和特定生长率最低, 饲料脂肪水平为4.2%组的增重率和特定生长率最高。不同饲料处理对三疣梭子蟹蟹体的水分、粗蛋白和灰分含量无显著影响, 饲料脂肪水平为9.01%组蟹体的脂肪含量最高, 饲料脂肪水平为1.8%组的蟹体脂肪含量最低。饲料处理显著影响各处理组的性腺指数, 饲料脂肪水平为13.76%组的性腺指数最低。而不同饲料处理对各组的肝胰腺指数、壳宽、壳长和壳高无显著影响。本实验结果显示, 4.2%—13.76%的饲料脂肪水平能满足三疣梭子蟹正常生长和发育所需。 相似文献
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