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Effects of dietary lipid-to-carbohydrate ratio on growth and carbohydrate metabolism in juvenile cobia (Rachycentron canadum)

文献类型： 外文期刊

作者： Zhao, Hongxia 1 ; Cao, Junming 1 ; Chen, Xiaoying 1 ; Wang, Guoxia 1 ; Hu, Junru 1 ; Chen, Bing 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Peoples R China

2.South China Minist Agr, Key Lab Anim Nutr & Feed Sci, Guangzhou 510640, Peoples R China

3.Guangdong Key Lab Anim Breeding & Nutr, Guangzhou 510640, Peoples R China

关键词： Rachycentron canadum; Lipid-to-carbohydrate ratio; Growth; Carbohydrate metabolism

期刊名称：ANIMAL NUTRITION （ 影响因子：6.383； 五年影响因子：5.497 ）

ISSN： 2405-6383

年卷期： 2020 年 6 卷 1 期

页码：

收录情况： SCI

摘要： This experiment was conducted to investigate the effects of dietary lipid-to-carbohydrate ratio on growth and carbohydrate metabolism in juvenile cobia (Rachycentron canadum). Six isonitrogenous diets were prepared to vary in lipid-to-carbohydrate ratio (g/g) as follows: D1, 2.26; D2, 1.31; D3, 0.78; D4, 0.47; D5, 0.34; and D6, 0.23. Cobias were fed to satiety for 8 weeks. The weight gain and protein efficiency ratio in D1 group were significantly lower than those in other groups (P < 0.05), accompanied by a lower level of feed conversion ratio (P < 0.05). Protein retention efficiency in D4 and D6 and whole body protein in D4 and D5 were significantly higher than those in D1 group (P < 0.05). Survival rate in D4 group was the highest among all groups and was significantly higher than that in D1, D2 and D5 (P < 0.05). In terms of serum triglyceride, D1 and D2 were significantly higher than D6 (P < 0.05). Hepatosomatic index in D3 and D4 was significantly lower than that in D1 (P < 0.05). Fructose-1,6-diphosphatase in D4 was significantly higher than that in D1 and D3 (P < 0.05). Phosphofructokinase in D3 and D4 and malic enzyme in D4 and D5 were significantly higher than those in other groups (P < 0.05). Results indicate that cobia utilizes carbohydrates as energy source more efficiently than it utilizes lipids. The optimal lipid-to-carbohydrate ratio in juvenile cobia diets is 0.47. (c) 2020, Chinese Association of Animal Science and Veterinary Medicine. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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