Abbreviations: ALA, α-linolenic acid; DPA, docosapentaenoic acid; EO, Echium oil; ETA, eicosatetraenoic acid; FA, fatty acid; FAMB, fatty acid mass balance; FO, fish oil; LC-PUFA, long-chain PUFA; NMB, negative mass balance; RO, rapeseed oil; SDA, stearidonic acid; VO, vegetable oil