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用5组含不同浓度脂肪(5%~21%)的等氮饲料来研究脂肪水平对日本黄姑鱼生产性能、营养利用率和体成分的影响,日本黄姑鱼初体重为6.67±0.18 g。每组3个重复,每个重复15尾鱼,试验共进行8周。与饲喂高脂饲粮7%~21%相比,低脂饲粮5%~13%鱼的增重、特定生长率显著增加(P<0.05)。脂肪水平从5%增加到21%,日本黄姑鱼的采食量和日采食量呈下降趋势。饲料中添加脂肪9%~13%可以提高日本黄姑鱼的蛋白质利用率。与饲喂高浓度脂肪13%~21%相比,饲喂含脂肪水平5%和9%的鱼脏体比、肝体比和肠脂比显著下降(P<0.05)。与其他组相比,饲喂低水平脂肪组黄姑鱼的全身脂肪含量显著降低(P<0.05)。随着饲粮中脂肪含量的增加,肝脏内的脂肪含量有增加趋势(P<0.05),但肝脏内蛋白质和水的含量显著下降(P<0.05)。根据增重的二次回归分析表明,在日本黄姑鱼饲粮中脂肪水平应为8.22%。
The effect of fat level on the performance, nutrition utilization and body composition of C. japonicus was studied using five isonitrogenous diets containing different concentrations of fat (5% -21%). The initial weight of C. japonicus was 6.67 ± 0.18 g . Three replicates per group, 15 fish per replicate, for a total of 8 weeks. Compared with 7% ~ 21% of high fat diets, the specific growth rate of 5% ~ 13% of low fat diets increased significantly (P <0.05). Fat levels increased from 5% to 21%, Japanese yellow croaker feed intake and daily feed intake showed a downward trend. Adding 9% to 13% fat to feed can increase the protein utilization of Japanese yellow croaker. Compared with 13% -21% of high-fat diets fed with 5% and 9% fat-containing fish, the ratio of liver to body and intestinal fat decreased significantly (P <0.05). Compared with the other groups, the body fat content was significantly decreased (P <0.05) in N. cumingii fed low fat diet. With the increase of dietary fat, the content of fat in liver increased (P <0.05), while the content of protein and water in liver decreased significantly (P <0.05). According to the second-order regression analysis of weight gain, the level of fat in Japanese yellowtail diet should be 8.22%.