Monounsaturated fatty acids (MUFA)-rich and n-6 polyunsaturated fatty acid (n-6 PUFA)-rich vegetable oils are increasingly used as fish oil replacers for aquafeed formulation. The present study investigated the fatty acid metabolism in juvenile European sea bass (Dicentrarchus labrax, 38.4 g) fed diets containing fish oil (FO, as the control treatment) or two different vegetable oils (the MUFA-rich canola/rapeseed oil, CO; and the n-6 PUFA-rich cottonseed oil, CSO) tested individually or as a 50/50 blend (CO/CSO). The whole-body fatty acid balance method was used to deduce the apparent in vivo fatty acid metabolism. No effect on growth performance and feed utilization was recorded. However, it should be noted that the fish meal content of the experimental diets was relatively high, and thus the requirement for n-3 long-chain polyunsaturated fatty acid (n-3 LC-PUFA) may have likely been fulfilled even if dietary fish oil was fully replaced by vegetable oils. Overall, relatively little apparent in vivo fatty acid bioconversion was recorded, whilst the apparent in vivo β-oxidation of dietary fatty acid was largely affected by the dietary lipid source, with higher rate of β-oxidation for those fatty acids which were provided in dietary surplus. The deposition of 20:5n-3 and 22:6n-3, as % of the dietary intake, was greatest for the fish fed on the CSO diet. It has been shown that European sea bass seems to be able to efficiently use n-6 PUFA for energy substrate, and this may help in minimizing the β-oxidation of the health benefiting n-3 LC-PUFA and thus increase their deposition into fish tissues.

译文

:富含不饱和脂肪酸(MUFA)和富含n-6多不饱和脂肪酸(n-6 PUFA)的植物油越来越多地用作水产饲料配方的鱼油替代品。本研究调查了以鱼油(FO作为对照)或两种不同的植物油(富含MUFA的低芥酸菜籽/菜籽油,CO;食用鱼油)作为饮食的欧洲鲈鱼(Dicentrarchus labrax,38.4 g)日粮中的脂肪酸代谢。以及分别或以50/50的混合物(CO / CSO)进行测试的n-6富含PUFA的棉籽油(CSO)。全身脂肪酸平衡法用于推导体内明显的脂肪酸代谢。没有记录到对生长性能和饲料利用率的影响。但是,应注意的是,实验饮食中鱼粉含量较高,因此即使食用鱼,也可能满足n-3长链多不饱和脂肪酸(n-3 LC-PUFA)的要求。油被植物油完全替代。总的来说,记录的体内脂肪酸的明显表观生物转化相对较少,而膳食脂肪酸的表观体内β-氧化作用很大程度上受膳食脂质来源的影响,膳食中提供的那些脂肪酸的β-氧化率较高。剩余。以日粮摄入量的百分比计,20:5n-3和22:6n-3的沉积量对以CSO日粮喂养的鱼类最大。研究表明,欧洲鲈鱼似乎能够有效地将n-6 PUFA用作能量底物,这可能有助于将有益于健康的n-3 LC-PUFA的β-氧化作用降至最低,从而增加其在鱼类中的沉积组织。

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