Effect of Diet on the Deposition of n-3 Fatty Acids, Conjugated Linoleic and C18:1trans Fatty Acid Isomers in Muscle Lipids of German Holstein Bulls

Dirk Dannenberger, Gerd Nuernberg, Nigel D. Scollan, Wiebke Schabbel, Hans Steinhart, Klaus Ender, Karin Nuernberg

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106 Citations (SciVal)

Abstract

This study examined the effects of feeding diets rich in either n-3 or n-6 polyunsaturated fatty acids (PUFA) on the fatty acid composition of longissimus muscle in beef bulls. Thirty-three German Holstein bulls were randomly allocated to either an indoor concentrate system or periods of pasture feeding (160 days) followed by a finishing period on a concentrate containing linseed to enhance the contents of n-3 PUFA and conjugated linoleic acids (CLA) in beef muscle. The relative proportion and concentration (mg/100 g fresh muscle) of n-3 fatty acids in the phospholipid and triglyceride fractions were significantly increased (p ≤ 0.05) in muscle lipids of pasture-fed bulls. The pasture feeding affected the distribution of individual CLA isomers in the muscle lipids. The proportion of the most prominent isomer, CLA cis-9,trans-11, was decreased from 73.5 to 65.0% of total CLA in bulls fed on concentrate as compared to pasture. The second most abundant CLA isomers were CLA trans-7,cis-9 and CLA trans-11,cis-13 in bulls fed on concentrate and pasture, respectively. Diet had no effect on the concentration of C18:1 trans-11. In contrast, the concentration of the C18:1 trans-13/14, trans-15, and trans-16 isomers in the muscle lipids was up to two times higher in pasture-fed as compared to concentrate-fed bulls. Pasture feeding enhanced the concentration of n-3 fatty acids, but the diet had no effect on the concentration of CLA cis-9,trans-11.
Original languageEnglish
Pages (from-to)6607-6615
Number of pages9
JournalJournal of Agricultural and Food Chemistry
Volume52
Issue number21
Early online date18 Sept 2004
DOIs
Publication statusPublished - 20 Oct 2004

Keywords

  • beef
  • n-3 fatty acids
  • phospholipids
  • trigylcerides
  • conjugated linoleic acid isomers
  • trans fatty acids

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