Effects of feeding flaxseed or sunflower-seed in high-forage diets on beef production,quality and fatty acid composition |
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| Authors: | C. Mapiye J.L. Aalhus T.D. Turner D.C. Rolland J.A. Basarab V.S. Baron T.A. McAllister H.C. Block B. Uttaro O. Lopez-Campos S.D. Proctor M.E.R. Dugan |
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| Affiliation: | 1. Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, Alberta T4L 1W1, Canada;2. Alberta Agriculture and Rural Development, Lacombe Research Centre, 6000 C & E Trail, Lacombe, Alberta T4L 1W1, Canada;3. Agriculture and Agri-Food Canada, Lethbridge Research Centre, 1st Avenue South 5403, PO Box 3000, Lethbridge, Alberta T1J 4B1, Canada;4. Agriculture and Agri-Food Canada, Brandon Research Centre, 18th Street and Grand Valley Road, P.O. Box 1000A, RR3, Brandon, Manitoba R7A 5Y3, Canada;5. Metabolic and Cardiovascular Diseases (MCVD) Laboratory, Alberta Diabetes and Mazankowski Institutes, Li Ka Shing (LKS) Centre for Health Research Innovation, University of Alberta, Edmonton, Alberta T6G 2E1, Canada, |
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| 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. |
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| Keywords: | AD, atypical dienes ADG, average daily gain ALA, α-linolenic acid BCFA, branched-chain fatty acids BH, biohydrogenation c, cis CLA, conjugated linoleic acids CLNA, conjugated linolenic acids d, days DHA, docosahexaenoic acid DM, dry matter DMI, dry matter intake DPA, docosapentaenoic acid EPA, eicosapentaenoic acid FA, fatty acids FAME, fatty acid methyl esters GC, gas chromatography FS, flaxseed GH, grass hay LA, linoleic acid LT, longissimus thoracis MUFA, monounsaturated fatty acids n &minus 3, omega-3 n &minus 6, omega-6 PPO, polyphenol oxidase PUFA, polyunsaturated fatty acids RC, red clover silage RA, rumenic acid SS, sunflower seed SFA, saturated fatty acids t, trans VA, vaccenic acid vs., versus |
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