Rymer C, Givens D I
Department of Agriculture, University of Reading, Reading, RG6 6AR, United Kingdom.
Lipids. 2005 Feb;40(2):121-30. doi: 10.1007/s11745-005-1366-4.
There is clear evidence of the nutritional benefits of consuming long-chain n-3 PUFA, which are found predominantly in oily fish. However, oily fish consumption, particularly in the United Kingdom, is declining, as is the consumption of all meats with the exception of poultry, which has increased in consumption by 73% in the last 30 yr. This pattern, if less marked, is reflected throughout Europe, and therefore one means of increasing long-chain n-3 PUFA consumption would be to increase the long-chain n-3 PUFA content in the edible tissues of poultry. This review considers the feasibility of doing this, concentrating particularly on chickens and turkeys. It begins by summarizing the benefits to human health of consuming greater quantities of n-3 FA and the sources of n-3 PUFA in the human diet. The literature on altering the FA composition of poultry meat is then reviewed, and the factors affecting the incorporation of n-3 PUFA into edible tissues of poultry are investigated. The concentration of alpha-linolenic acid (ALA) in the edible tissues of poultry is readily increased by increasing the concentration of ALA in the birds' diet (particularly meat with skin, and dark meat to a greater extent than white meat). The concentration of EPA in both white and dark meat is also increased when the birds' diet is supplemented with EPA, although supplementing the diet with the precursor (ALA) does not result in a noticeable increase in EPA content in the edible tissues. Although supplementing the birds' diets with relatively high concentrations of DHA does result in an increased concentration of DHA in the tissues, the relationship between dietary and tissue concentrations of DHA is much weaker than that observed with ALA and EPA. The impact that altering the FA composition of edible poultry tissue may have on the organoleptic and storage qualities of poultry products is also considered.
有明确证据表明食用长链n-3多不饱和脂肪酸(PUFA)具有营养益处,长链n-3 PUFA主要存在于油性鱼类中。然而,油性鱼类的消费量在下降,尤其是在英国,除了家禽肉消费量增加了73%外,所有肉类的消费量都在下降,这种模式在整个欧洲虽不那么明显,但也有所体现。因此,增加长链n-3 PUFA消费量的一种方法是提高家禽可食用组织中的长链n-3 PUFA含量。本综述探讨了这样做的可行性,尤其关注鸡和火鸡。首先总结了摄入更多n-3脂肪酸对人体健康的益处以及人类饮食中n-3 PUFA的来源。接着回顾了关于改变禽肉脂肪酸组成的文献,并研究了影响n-3 PUFA掺入家禽可食用组织的因素。通过增加家禽日粮中α-亚麻酸(ALA)的浓度(特别是带皮的肉,深色肉比白色肉增加的程度更大),家禽可食用组织中ALA的浓度很容易提高。当给家禽日粮补充二十碳五烯酸(EPA)时,白色肉和深色肉中EPA的浓度也会增加,尽管用前体(ALA)补充日粮并不会导致可食用组织中EPA含量显著增加。虽然给家禽日粮补充相对高浓度的二十二碳六烯酸(DHA)确实会使组织中DHA浓度增加,但日粮中DHA与组织中DHA浓度之间的关系比ALA和EPA的情况要弱得多。还考虑了改变家禽可食用组织脂肪酸组成可能对禽肉产品感官和储存品质产生的影响。