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Journal of Lipid Research, Vol. 44, 314-319, February 2003
Copyright © 2003 by Lipid Research, Inc.

Whole-body ß-oxidation of 18:26 and 18:33 in the pig varies markedly with weaning strategy and dietary 18:33

Richard P. Bazinet^1,*, Ewen G. McMillan, Ravi Seebaransingh, Anthony M. Hayes and Stephen C. Cunnane^*

^* Department of Nutritional Science, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
Maple Leaf Foods Agresearch, Guelph, ON, Canada
Department of Pathobiology, University of Guelph, Guelph, ON, Canada

¹ To whom correspondence should be addressed. e-mail: richard.bazinet{at}utoronto.ca

Segregated early weaning (SEW) into a cleaner nursery increases food intake and growth in pigs, presumably because of reduced immune stimulation compared with conventionally reared, nonsegregated pigs (NSW). The aim of the present study was to evaluate the oxidation of linoleic acid (18:26) and -linolenic acid (18:33) in SEW and NSW pigs. Pigs consumed a control or high 18:33 diet (6 PUFA/3 PUFA; 21.3 vs. 2.5, respectively) and were weaned at either 14 days old into a SEW nursery or at 21 days old into a conventional NSW nursery. The major acute-phase protein of pigs but not haptoglobin increased in 35-day-old NSW pigs. NSW pigs had 15–25% lower carcass 18:26 and 20–30% lower carcass 18:33 (% composition) at 49 days old. Between 35- and 49-days-old, NSW pigs had a higher whole-body oxidation of 18:26 (40–120%) and 18:33 (30–80%). The high 18:33 diet decreased the whole-body oxidation of 18:26 by 73% and of 18:33 by 63% in NSW pigs.

We conclude that moderately cleaner housing SEW significantly decreases 18:26 and 18:33 oxidation in pigs.

Abbreviations: 20:46, arachidonic acid; 18:26, linoleic acid; 18:33, -linolenic acid; 22:63, docosahexaenoic acid; pigMAP, major acute phase protein of pigs; MUFA, monounsaturated fatty acid; NSW, nonsegregated weaning; 18:19, oleic acid; 16:0, palmitic acid; PUFA, polyunsaturated fatty acid; SFA, saturated fatty acid; SEW, segregated early weaning; 18:0, stearic acid

Supplementary key words polyunsaturated fatty acid • linoleic acid • -linolenic acid • ß-oxidation pig weaning

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