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The recent success of dehulled sunflower meals on the French market encouragesreconsideration of the possibility of applying dehulling techniques to rapeseed. Hullsaccount for 18−20% of rapeseedmass; they contain mostly fibres (72%, 78% and 99%, respectively of the seeds’ NDF, ADFand ADL). Complete removal of these hulls would result in a high (43%) protein meal withenhanced added value. However, the technical feasibility of producing such a meal isimpeded by the relatively high oil content of the hull fraction. This article presents amodel of mass balance that takes account both of the purity of the “hull” and “kernel”fractions and comparisons of gross margins between conventional processing anddehulling-based processing. The value of dehulled rapeseed meal is assessed against both arange of market scenarios and the composition and price of a selection of alternativefeeds. The gross margin differential favours dehulling only in periods where proteins areexpensive and oil relatively cheap, as at present. Reducing the oil content of the hullsaffects considerably the profitability of dehulling whereas modification of the proteincontent has only a modest impact. An important unknown is the effect of antinutritionalfactors on the final price of dehulled meals. Management of the glucosinolates residuesthrough processing might decrease their noxiousness though the information on this isscant. Since this lack of knowledge is an impediment to the implementation of dehullingtechnology, research and development investments should start by addressing this question.Technical solutions could be developed to recover the oil contained in the hulls. Suchsolutions include expelling, aqueous extraction or tail-end dehulling after directextraction of the seeds

A re-examination of the technical feasibility and economic viability of rapeseed dehulling