Document Detail

Effect of dietary conjugated linoleic acid on the composition of egg yolk lipids.
MedLine Citation:
PMID:  10560841     Owner:  NLM     Status:  MEDLINE    
Forty-eight 27-wk-old White Leghorn hens were assigned randomly to four diets containing 0, 1.25, 2.5, or 5.0% conjugated linoleic acid (CLA). Hens were fed the CLA diets for 2 wk before eggs were collected for the study. Classes of egg yolk lipids were separated, and fatty acid concentrations in total lipid, triglyceride (TG), phosphatidylethanolamine (PE), and phosphatidylcholine (PC) were analyzed to determine the incorporation of dietary CLA isomers into different classes of egg yolk lipids. The amounts of CLA incorporated into lipid, PC, PE, and TG of egg yolk were proportional to the levels of CLA in the diet. However, more CLA was incorporated in TG than in PC and PE. The incorporation rates of different CLA isomers into different classes of lipids also were significantly different: cis-9, trans-11 and cis-10, trans-12 CLA were deposited more in TG, but cis-11, trans-13 CLA deposition in TG was significantly less. There were large differences in the concentrations of cis-8, trans-10 CLA in PC and PE. The inclusion of CLA into the diet influenced the metabolism of polyunsaturated fatty acids. The contents of 5,8,11,14-eicosatetraenoic, 9,12-octadecadienoic, and 9,12,15-octadecatrienoic acids were decreased as dietary CLA increased. Three isomers of hexadecadienoic acid were found in egg yolk lipids from hens fed 5% dietary CLA. The detection of hexadecadienoic acid isomers in lipid indicates that the utilization of CLA as an energy source after the first round of beta-oxidation may be less favorable than that of 9,12-octadecadienoic acid.
M Du; D U Ahn; J L Sell
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  78     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  1999 Nov 
Date Detail:
Created Date:  1999-11-26     Completed Date:  1999-11-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1639-45     Citation Subset:  IM    
Department of Animal Science, Iowa State University, Ames 50011-3150, USA.
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MeSH Terms
Arachidonic Acids / analysis
Dietary Fats, Unsaturated / pharmacology*
Egg Yolk / chemistry*
Linoleic Acid / analysis,  pharmacology*
Linolenic Acids / analysis
Lipids / analysis*
Phosphatidylcholines / analysis
Phosphatidylethanolamines / analysis
Triglycerides / analysis
Reg. No./Substance:
0/Arachidonic Acids; 0/Dietary Fats, Unsaturated; 0/Linolenic Acids; 0/Lipids; 0/Phosphatidylcholines; 0/Phosphatidylethanolamines; 0/Triglycerides; 2197-37-7/Linoleic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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