Australian Cooperative Research Centre for Sheep Industry Innovation, Armidale, NSW, Australia.
Br J Nutr. 2012 Jul 14;108(1):71-9. doi: 10.1017/S0007114511005411. Epub 2011 Oct 20.
Vegetable oils containing stearidonic acid (SDA, 18 : 4n-3) are considered better precursors of long-chain n-3 PUFA (LC n-3 PUFA) than those with only α-linolenic acid (ALA, 18 : 3n-3). The present study re-examined this premise using treatments where added ALA from linseed oil was matched with ALA plus SDA from echium oil. Lambs (n 6) were abomasally infused with saline (control (C), 25 ml), echium oil low (EL, 25 ml), echium oil high (EH, 50 ml), linseed oil low (LL, 25 ml) or linseed oil high (LH, 50 ml) for 4 weeks. The basal ration used was identical across all treatments. EPA (20 : 5n-3) in meat increased from 6·5 mg in the C lambs to 16·8, 17·7, 13·5 and 11·7 (SEM 0·86) mg/100 g muscle in the EL, EH, LL and LH lambs, respectively. For muscle DPA (docosapentaenoic acid; 22 : 5n-3), the corresponding values were 14·3, 22·2, 18·6 18·2 and 19·4 (SEM 0·57) mg/100 g muscle. The DHA (22 : 6n-3) content of meat was 5·8 mg/100 g in the C lambs and ranged from 4·53 to 5·46 (SEM 0·27) mg/100 g muscle in the oil-infused groups. Total n-3 PUFA content of meat (including ALA and SDA) increased from 39 mg to 119, 129, 121 and 150 (SEM 12·3) mg/100 g muscle. We conclude that both oil types were effective in enhancing the EPA and DPA, but not DHA, content of meat. Furthermore, we conclude that, when balanced for precursor n-3 fatty acid supply, differences between linseed oil and echium oil in enriching meat with LC n-3 PUFA were of little, if any, nutritional significance.
含有 stearidonic 酸（SDA，18:4n-3）的植物油被认为是长链 n-3PUFA（LC n-3PUFA）比只有α-亚麻酸（ALA，18:3n-3）的更好的前体。本研究使用添加亚麻籽油中的 ALA 与echium 油中的 ALA 和 SDA 相匹配的处理方法重新检验了这一前提。绵羊（n 6）通过瘤胃内灌注生理盐水（对照（C），25ml）、echium 低油（EL，25ml）、echium 高油（EH，50ml）、亚麻籽油低（LL，25ml）或亚麻籽油高（LH，50ml）4 周。所有处理都使用相同的基础日粮。肉中的 EPA（20:5n-3）从 C 组绵羊的 6.5mg 分别增加到 EL、EH、LL 和 LH 组绵羊的 16.8、17.7、13.5 和 11.7（SEM 0.86）mg/100g 肌肉。对于肌肉中的 DPA（二十二碳五烯酸；22:5n-3），相应的值分别为 14.3、22.2、18.6、18.2 和 19.4（SEM 0.57）mg/100g 肌肉。C 组绵羊肌肉中的 DHA（22:6n-3）含量为 5.8mg/100g，油灌注组肌肉中的含量范围为 4.53-5.46（SEM 0.27）mg/100g。肌肉中总 n-3PUFA（包括 ALA 和 SDA）含量从 39mg 增加到 119、129、121 和 150（SEM 12.3）mg/100g 肌肉。我们的结论是，两种油都能有效地增加 EPA 和 DPA，但不能增加 DHA，从而增加肉中的含量。此外，我们的结论是，当以 n-3 脂肪酸前体的供应为平衡时，亚麻籽油和 echium 油在富含 LC n-3PUFA 方面的差异，如果有的话，营养意义不大。
