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 b 0.05), significantly reducedmeat off-flavor intensity (P b 0.05), and significantly increased intramuscular
proportions of vaccenic (t11-18:1), rumenic (c9,t11-CLA) and n−6 fatty acids (FA, P b 0.05). Feeding
diets containing FS versus SS produced significantly darker and reddermeatwith greater proportions of atypical
dienes (P b 0.05). A significant forage × oilseed type interaction (P b 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 b 0.05) and significantly influenced intramuscular FA composition (P b 0.05), but overall, forage effects on FA
profiles were limited compared to effects of oilseed.
Yearling steers were fed 70:30 forage:concentrate diets for 205 d, with either grass hay (GH) or red cloversilage (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 carcassattributes (P b 0.05), significantly reducedmeat off-flavor intensity (P b 0.05), and significantly increased intramuscularproportions of vaccenic (t11-18:1), rumenic (c9,t11-CLA) and n−6 fatty acids (FA, P b 0.05). Feedingdiets containing FS versus SS produced significantly darker and reddermeatwith greater proportions of atypicaldienes (P b 0.05). A significant forage × oilseed type interaction (P b 0.05) was found for n−3 FA, α-linolenicacid, and conjugated linolenic acid, with their greatest intramuscular proportions found when feeding theRC-FS diet. Feeding GH versus RC also significantly improved growth and carcass attributes, sensory tenderness(P b 0.05) and significantly influenced intramuscular FA composition (P b 0.05), but overall, forage effects on FAprofiles were limited compared to effects of oilseed.
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