Metabolisable energy value and composition of rapeseed meal and of fractions derived therefrom by air‐classification1

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Abstract
It is possible to separate rapeseed meal into two fractions, one of lower hull and higher protein content, the other of higher hull and lower protein content than whole rapeseed meal. The low‐hull fraction was found to contain about 25% more, and the high‐hull fraction about 25% less, metabolisable energy than the whole rapeseed meal. Soluble tannins, oxazolidinethione, isothiocyanates and phosphorus were found to be concentrated in the endosperm rather than the pericarp of the seed while with calcium the reverse occurred. No consistent changes in amino acid distribution resulting from the air‐classification of whole rapeseed meal into low‐hull and high‐hull fractions were observed.