title: Effects of feeding flaxseed or sunflower-seed in high-forage diets on beef production, quality and fatty acid composition.
abstract: Yearling steers were fed 70:30 forage:concentrate diets for 205 d, with either grass hay (GH) or red clover silage (RC) as the forage source, and concentrates containing either sunflower-seed (SS) or flaxseed (FS), each providing 5.4% oil to diets. Feeding diets containing SS versus FS significantly improved growth and carcass attributes (P<0.05), significantly reduced meat off-flavor intensity (P<0.05), and significantly increased intramuscular proportions of vaccenic (t11-18:1), rumenic (c9,t11-CLA) and n-6 fatty acids (FA, P<0.05). Feeding diets containing FS versus SS produced significantly darker and redder meat with greater proportions of atypical dienes (P<0.05). A significant forage × oilseed type interaction (P<0.05) was found for n-3 FA, α-linolenic acid, and conjugated linolenic acid, with their greatest intramuscular proportions found when feeding the RC-FS diet. Feeding GH versus RC also significantly improved growth and carcass attributes, sensory tenderness (P<0.05) and significantly influenced intramuscular FA composition (P<0.05), but overall, forage effects on FA profiles were limited compared to effects of oilseed.
authors.affiliation: Agriculture and Agri-Food Canada, Lacombe Research Centre, Lacombe, Alberta, 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: B
authors.initials: B
authors.lastname: Uttaro
authors.forename: O
authors.initials: O
authors.lastname: Lopez-Campos
authors.forename: S D
authors.initials: SD
authors.lastname: Proctor
authors.forename: M E R
authors.initials: ME
authors.lastname: Dugan
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle; D019597:Flax / Q000737:chemistry*; D063427:Food Quality; D006368:Helianthus / Q000737:chemistry*; D006801:Humans; D044243:Linoleic Acids, Conjugated / Q000737:chemistry; D008297:Male; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry; D006109:Poaceae / Q000737:chemistry; D012417:Rumen / Q000737:chemistry; D012639:Seeds / Q000737:chemistry*; D013649:Taste; D017962:alpha-Linolenic Acid / Q000737:chemistry
chemical_list: D044243:Linoleic Acids, Conjugated; D017962:alpha-Linolenic Acid