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Effect of dietary lipid on the content of conjugated linoleic acid (CLA) in beef muscle

Published online by Cambridge University Press:  18 August 2016

M. Enser ,
N. D. Scollan ,
N. J. Choi ,
E. Kurt ,
K. Hallett  and
J. D. Wood
M. Enser
Affiliation:
Division of Food Animal Science, University of Bristol, Langford, Bristol BS40 5DU
N. D. Scollan
Affiliation:
Institute of Grassland and Environmental Research, Plas Goggerdan, Aberystwyth SY23 3EB
N. J. Choi
Affiliation:
Institute of Grassland and Environmental Research, Plas Goggerdan, Aberystwyth SY23 3EB
E. Kurt
Affiliation:
Division of Food Animal Science, University of Bristol, Langford, Bristol BS40 5DU
K. Hallett
Affiliation:
Division of Food Animal Science, University of Bristol, Langford, Bristol BS40 5DU
J. D. Wood
Affiliation:
Division of Food Animal Science, University of Bristol, Langford, Bristol BS40 5DU
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Abstract

We have examined the effect of dietary fats containing n-3 polyunsaturated fatty acids on the conjugated linoleic acid (CLA) content of beef m. longissimus lumborum. Four groups of eight Charolais steers were given, for 120 days, grass silage plus a barley/sugar-beet feed concentrate containing one of four fat supplements: Megalac (saturated), linseed (high 18: 3),fish oil (high 20: 5 n-3, eicosapentenoic acid and 22: 6 n-3, docosahexaenoic acid) or linseed plus fish oil. The concentrates supplied 400 g/kg dry-matter (DM) intake and were designed to supply 45 g/kg of the total dietary fat calculated to be 60 g/kg of DM and to contain similar amounts of linoleic acid. Muscle from steers given the Megalac supplement contained 11·3 mg CLA per 100 g muscle and this was increased two- to three-fold in animals given the more unsaturated fat supplements. The increased deposition of CLA was similar for both linseed and fish oil supplements although the concentrations of total n-3 polyunsaturated fatty acids in the fish oil diet were much less than in the linseed diet. This suggests potent inhibition of conversion of CLA to trans vaccenic acid by fish oil fatty acids or their rumen metabolites.

Keywords

beeffatty acidshydrogenationlinoleic acidrumen
Type
Research Article
Information
Animal Science , Volume 69 , Issue 1 , August 1999 , pp. 143 - 146
Copyright
Copyright © British Society of Animal Science 1999

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