title: The effects of feeding flaxseed to beef cows given forage based diets on fatty acids of longissimus thoracis muscle and backfat.
abstract: This study was conducted to investigate changes in fatty acid profiles of beef cows fed grass hay or barley silage based diets, with or without flaxseed supplementation. Both flaxseed and hay feeding increased levels of α-linolenic acid (LNA; 18:3n-3) in longissimus thoracis and backfat (P<0.001). A forage type by flaxseed level interaction was observed for most LNA biohydrogenation intermediates (P<0.05) that indicated feeding hay combined with flaxseed led to the greatest levels of total conjugated linolenic acid, total conjugated linoleic acid, total non-conjugated dienes and total trans-18:1. Predominant biohydrogenation intermediates included t11,c15-18:2, rumenic acid (c9,t11-18:2) and vaccenic acid (t11-18:1).
authors.affiliation: Lacombe Research Centre, Agriculture and Agri-Food Canada, Lacombe, AB, Canada.
authors.forename: R T
authors.initials: RT
authors.lastname: Nassu
authors.forename: M E R
authors.initials: ME
authors.lastname: Dugan
authors.forename: M L
authors.initials: ML
authors.lastname: He
authors.forename: T A
authors.initials: TA
authors.lastname: McAllister
authors.forename: J L
authors.initials: JL
authors.lastname: Aalhus
authors.forename: N
authors.initials: N
authors.lastname: Aldai
authors.forename: J K G
authors.initials: JK
authors.lastname: Kramer
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D005227:Fatty Acids / Q000032:analysis*; D019597:Flax; D044243:Linoleic Acids, Conjugated / Q000032:analysis; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry*; D012820:Silage / Q000032:analysis; D017962:alpha-Linolenic Acid / Q000032:analysis
chemical_list: D005227:Fatty Acids; D044243:Linoleic Acids, Conjugated; D017962:alpha-Linolenic Acid