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Incorporation of n−3 fatty acids of fish oil into tissue and serum lipids of ruminants

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Lipids

Abstract

This study examines the biohydrogenation and utilization of the C20 and C22 polyenoic fatty acids in ruminants. Eicosapentaenoic (20∶5n−3) and docosahexaenoic (22∶6n−3) acids were not biohydrogenated to any significant extent by rumen microorganisms, whereas C18 polyenoic fatty acids were extensively hydrogenated. The feeding of protected fish oil increased the proportion of 20∶5 from 1% to 13–18% and 22∶6 from 2% to 7–9% in serum lipids and there were reductions in the proportion of stearic (18∶0) and linoleic (18∶2) acids. The proportion of 20∶5 in muscle phospholipids (PL) increased from 1.5% to 14.7% and 22∶6 from 1.0% to 4.2%; these acids were not incorporated into muscle or adipose tissue triacylglycerols (TAG). In the total PL of muscle, the incorporated 20∶5 and 22∶6 substituted primarily for oleic (18∶1) and/or linoleic (18∶2) acid, and there was no consistent change in the porportion of arachidonic (20∶4) acid.

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Abbreviations

CE:

cholesteryl esters

DAG:

diacylglycerols

FAME:

fatty acid methyl esters

FFA:

free fatty acids

PFO:

protected fish oil

PL:

phospholipids

TAG:

triacylglycerols

TLC:

thin-layer chromatography

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Authors and Affiliations

  1. Division of Animal Production, CSIRO, 2148, Prospect, N.S.W.

    John R. Ashes, Suresh K. Gulati & Trevor W. Scott

  2. Division of Human Nutrition, CSIRO, 5148, O'Halloran Hill, S.A., Australia

    Brian D. Siebert & Abla Z. Cuthbertson

Authors
  1. John R. Ashes
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  2. Brian D. Siebert
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  3. Suresh K. Gulati
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  4. Abla Z. Cuthbertson
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  5. Trevor W. Scott
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Ashes, J.R., Siebert, B.D., Gulati, S.K. et al. Incorporation of n−3 fatty acids of fish oil into tissue and serum lipids of ruminants. Lipids 27, 629–631 (1992). https://doi.org/10.1007/BF02536122

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  • DOI: https://doi.org/10.1007/BF02536122

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