title: Dietary influence on the m. longissimus dorsi fatty acid composition of lambs in relation to protein source.
abstract: Dietary lipid effect, as a consequence of protein supplement, on lamb m. longissimus dorsi fatty acid composition was investigated, with emphasis on biohydrogenation intermediates. Crossbred lambs (White Swedish Landrace × Texel) were fed a barley-based diet without (CON) or with protein supplements including peas (PEA), rapeseed cake (RC) or hempseed cake (HC). The HC diet resulted in the highest muscle 22:6n-3 proportion, with the RC diet being similar (P<0.05). Protein supplement did not affect the c9,t11 conjugated linoleic acid (CLA) proportion, however the HC diet increased some minor CLA isomers, including t10,c12 CLA (P<0.05). The t10-18:1 and total trans-18:1 were lowest for the RC diet (P<0.05), likely relating to rumen conditions and precursor availability. The saturated, monounsaturated and branched-chain fatty acids were largely unaffected by protein supplement. In conclusion, feeding the RC diet lowered the t10-18:1 and total trans-18:1 in meat, and modestly increased 22:6n-3 content. The direction of these changes would be beneficial, making the RC diet the preferred protein supplement; however the magnitude of the changes in the present experiment may not be sufficient to have an impact on human health.
authors.affiliation: Agriculture and Agri-Food Canada, Lacombe Research Centre, Lacombe, AB, Canada T4L 1W1. tyler.turner@agr.gc.ca
authors.forename: T D
authors.initials: TD
authors.lastname: Turner
authors.forename: L
authors.initials: L
authors.lastname: Karlsson
authors.forename: C
authors.initials: C
authors.lastname: Mapiye
authors.forename: D C
authors.initials: DC
authors.lastname: Rolland
authors.forename: K
authors.initials: K
authors.lastname: Martinsson
authors.forename: M E R
authors.initials: ME
authors.lastname: Dugan
mesh_terms: D000821:Animal Feed; D000818:Animals; D029741:Brassica rapa / Q000737:chemistry*; D001947:Breeding; D002188:Cannabis / Q000737:chemistry; D004032:Diet; D004041:Dietary Fats / Q000378:metabolism*; D004044:Dietary Proteins / Q000494:pharmacology*; D019587:Dietary Supplements; D005227:Fatty Acids / Q000378:metabolism*; D005229:Fatty Acids, Monounsaturated / Q000378:metabolism; D044243:Linoleic Acids, Conjugated / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism*; D018532:Pisum sativum / Q000737:chemistry; D010940:Plant Proteins / Q000494:pharmacology*; D012756:Sheep; D044242:Trans Fatty Acids / Q000378:metabolism
chemical_list: D004041:Dietary Fats; D004044:Dietary Proteins; D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated; D044243:Linoleic Acids, Conjugated; D010940:Plant Proteins; D044242:Trans Fatty Acids