Journal of Nutrition

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Journal of Nutrition Vol. 111 No. 2 February 1981, pp. 355-364
Copyright © 1981 by American Society for Nutrition
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Influence of Weed Seed Oil Contamination on the Nutritional Quality of Diets Containing Low Erucic Acid Rapeseed (Brassica napus, Tower cultivar) Oil When Fed to Rats1

S. Paul Rose, J. Milton Bell, Ian W. Wilkie2 and H. Bruno Schiefer2

Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0

Oils from three samples of rapeseed screenings and a sample of stinkweed seeds (Thlaspi arvense) were added to Tower rapeseed oil at three levels (5, 10, and 15%). The contaminated Tower oils were fed at 20% (w/w) of a purified diet to male weanling Sprague-Dawley rats for 16 weeks. The screenings oils caused no increase in the focal myocardial lesion index or lipidosis of the rat hearts. Stinkweed oil gave a significant increase in myocardial lipidosis and a nonsignificant increase of the myocarditis index. These were attributed to an imbalance in the fatty acid composition of the Tower oil for the specific requirements of the growing rat. Screenings oil contamination had no significant effects on the feed intake or growth of the animals. The growth of rats fed stinkweed oil-contaminated diets was significantly lower than other treatments when it was adjusted for feed intake by analysis of covariance. No treatment effects on body organ weights nor on blood lipid parameters were observed. The presence of weed seed oils, at the highest levels likely to be encountered in low erucic acid rapeseed oil, was concluded to have no significant influence on its nutritional value.

KEY WORDS: • rapeseed oil • weed seed oils • cardiopathogenicity

1 Supported by grants from the Natural Science and Engineering Research Council, Canada and the Rapeseed Association of Canada, Winnipeg, R3B 1B3.

2 Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0.

Manuscript received 31 March 1980.




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