Feeding EPA and DHA in both rodent and human studies resulted in a marked increase in n–3 LC-PUFAs in tissues at the expense of n–6 FAs (64). Similar to previous studies (60), we also observed that dietary DHA, more than EPA, lowered hepatic AA content, which may be partly due to the downregulation of Fads1 expression observed, which is involved in AA synthesis from LA. Because elongases are also essential in the biosynthesis of LC-PUFAs, we analyzed the effect of CO and FO on the hepatic expression of Elovl2 and Elovl5, and no impact of treatment on their expression was evident. Previously, feeding FO had no effect on Elovl2 mRNA abundance, but a down- regulation on Elovl5 mRNA levels has been observed (65, 66).