Samples (115) of rapeseed meal were collected from feedmills and crushing plants across Canada during July–December 1972. The samples averaged 7.7% moisture, 35.9% crude protein, 11.2% crude fibre, 3.8% ether extract, 6.5% ash and 7.0 mg glucosinolates per gram. By microscopy, 86% of the samples averaged 1.8% total impurities; 14% averaged 4.5% impurities or material other than rapeseed. These findings are discussed in relation to rapeseed grading standards and in relation to normal variation in rapeseed meal quality.
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Bell et al. (1976) studied this question.