title: Types of oilseed and adipose tissue influence the composition and relationships of polyunsaturated fatty acid biohydrogenation products in steers fed a grass hay diet.
abstract: The current study evaluated the composition and relationships of polyunsaturated fatty acid biohydrogenation products (PUFA-BHP) from the perirenal (PRF) and subcutaneous fat (SCF) of yearling steers fed a 70 % grass hay diet with concentrates containing either sunflower-seed (SS) or flaxseed (FS). Analysis of variance indicated several groups or families of structurally related FA, and individual FA within these were affected by a number of novel oilseed by fat depot interactions (P < 0.05). Feeding diets containing SS increased the proportions of non-conjugated 18:2 BHP (i.e., atypical dienes, AD) and conjugated linoleic acids (CLA) with the first double bond from carbon 7 to 9, trans-18:1 isomers with double bonds from carbon 6 to 12, and these PUFA-BHP had greater proportions in SCF compared to PRF (P < 0.05). Enrichment of conjugated linolenic acids, AD and CLA isomers with the first double bond in position 11 or 12, and t-18:1 isomers with double bonds from carbon 13 to 16 were achieved by feeding diets containing FS, with PRF having greater proportions than SCF (P < 0.05). Principal component analysis visually confirmed interaction effects on these groups/families of FA, and further confirmed or suggested a number of relationships between PUFA-BHP. Feeding SS or FS in a grass hay diet and exploiting adipose tissue differences, therefore, present unique opportunities to differentially enrich a number of PUFA-BHP which seem to have positive health potential in humans (i.e., t11-18:1, c9,t11-18:2 and c9,t11,c15-18:3).
authors.affiliation: Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C and E Trail, Lacombe, AB, T4L 1W1, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Mapiye
authors.forename: J L
authors.initials: JL
authors.lastname: Aalhus
authors.forename: T D
authors.initials: TD
authors.lastname: Turner
authors.forename: D C
authors.initials: DC
authors.lastname: Rolland
authors.forename: J A
authors.initials: JA
authors.lastname: Basarab
authors.forename: V S
authors.initials: VS
authors.lastname: Baron
authors.forename: T A
authors.initials: TA
authors.lastname: McAllister
authors.forename: H C
authors.initials: HC
authors.lastname: Block
authors.forename: S D
authors.initials: SD
authors.lastname: Proctor
authors.forename: M E R
authors.initials: ME
authors.lastname: Dugan
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002417:Cattle; D005231:Fatty Acids, Unsaturated / Q000378:metabolism*; D019597:Flax / Q000737:chemistry*; D006368:Helianthus / Q000737:chemistry / Q000196:embryology*; D006859:Hydrogen / Q000378:metabolism*; D006109:Poaceae
chemical_list: D005231:Fatty Acids, Unsaturated; D006859:Hydrogen