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Article: Analysis in variatio in cis-9, trans-11 conjugated linoleic acid (CLA) in milk fat of dairy cows
- Article from:
- Journal of Dairy Science
- Article date:
- September 1, 2002
- Author:
CopyrightCopyright American Dairy Science Association Sep 2002. Provided by ProQuest LLC. (Hide copyright information)
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Analysis of Variation in cis-9, trans-11 Conjugated Linoleic Acid (CLA) in Milk Fat of Dairy Cows1
ABSTRACT
Conjugated linoleic acid (CLA) is a fatty acid with numerous putative health benefits and is a natural component of ruminant-derived food products. An intermediate in rumen biohydrogenation is cis-9, trans-11 CLA, the major CLA isomer in milk fat. However, the major source of cis-9, trans-11 CLA in milk is endogenous synthesis by Delta^sup 9^-desaturase conversion of trans-11C^sub 18:1^, another rumen biohydrogenation intermediate. The desaturase indices serve as a proxy for Delta^sup 9^-desaturase activity and are calculated from the ratios of fatty acid pairs that represent ...