Studies on Goitrogenic Substance in Rapeseed

Part III. Effect of autoclaving on the quality of whole rapeseed and rapeseed meal

Abstract

Effects on the quality of whole rapeseed and rapeseed meal by autoclaving employed for destruction of oxazolidinethione-yielding thioglucosides were investigated using whole seed and defatted meal of Brassica napus and meal of B. campestris. When the whole seed was treated, autoclaving resulted in browning and high acid value of the oil, although the yield of the oil was increased. On the contrary, autoclaving of the seed meals improved the flavour of the meal with a slight loss of drymatter. Although a marked decrease of the water-solubility of protein was noted, the autoclaving increased the digestibility of the protein in the meal by pancreatin and pepsin. The digestibility of B. napus meal generally lower than that of B. campestris meal.