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Dietary n-3 and n-6 fatty acids alter avian metabolism: metabolism and abdominal fat deposition

Published online by Cambridge University Press:  09 March 2007

Ronald E. Newman ,
Wayne L. Bryden ,
Eva Fleck ,
John R. Ashes ,
William A. Buttemer ,
Leonard H. Storlien  and
Jeffery A. Downing
Ronald E. Newman*
Affiliation:
Faculty of Veterinary Science, University of Sydney, Camden, NSW, Australia Smart Food Centre, University of Wollongong, NSW, Australia
Wayne L. Bryden
Affiliation:
Faculty of Veterinary Science, University of Sydney, Camden, NSW, Australia Smart Food Centre, University of Wollongong, NSW, Australia
Eva Fleck
Affiliation:
CSIRO Livestock Industries, Prospect, NSW, Australia
John R. Ashes
Affiliation:
CSIRO Livestock Industries, Prospect, NSW, Australia
William A. Buttemer
Affiliation:
Departments of Biological and Biomedical Sciences, University of Wollongong, NSW, Australia
Leonard H. Storlien
Affiliation:
Departments of Biological and Biomedical Sciences, University of Wollongong, NSW, Australia Smart Food Centre, University of Wollongong, NSW, Australia
Jeffery A. Downing
Affiliation:
Faculty of Veterinary Science, University of Sydney, Camden, NSW, Australia Smart Food Centre, University of Wollongong, NSW, Australia
*
*Corresponding author: Dr Ron Newman, fax +61 2 4655 0693, email ronaldn@camden.usyd.edu.au
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Abstract

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The effects of dietary saturated fatty acids and polyunsaturated fatty acids (PUFA) of the n-3 and n-6 series on weight gain, body composition and substrate oxidation were investigated in broiler chickens. At 3 weeks of age three groups of chickens (n 30; ten birds per group) were fed the fat-enriched experimental diets for 5 weeks. These diets were isonitrogenous, isoenergetic and contained 208 g protein/kg and 80 g edible tallow, fish oil or sunflower oil/kg; the dietary fatty acid profiles were thus dominated by saturated fatty acids, n-3 PUFA or n-6 PUFA respectively. Resting RQ was measured in five birds from each treatment group during weeks 4 and 5 of the experiment. There were no significant differences between treatments in total feed intake or final body mass. Birds fed the PUFA diets had lower RQ and significantly reduced abdominal fat pad weights (P<0·01) compared with those fed tallow. The dietary lipid profile changes resulted in significantly greater partitioning of energy into lean tissue than into fat tissue (calculated as breast lean tissue weight:abdominal fat mass) in the PUFA groups compared with the saturated fat group (P<0·01; with no difference between the n-3 and n-6 PUFA groups). In addition, the PUFA-rich diets lowered plasma concentrations of serum triacylglycerols and cholesterol. The findings indicate that dietary fatty acid profile influences nutrient partitioning in broiler chickens.

Keywords

Polyunsaturated fatty acidsChickensTriacylglycerolsEnergy metabolismBody composition
Type
Research Article
Information
British Journal of Nutrition , Volume 88 , Issue 1 , July 2002 , pp. 11 - 18
Copyright
Copyright © The Nutrition Society 2002

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