Prices of mustard and cottonseed oils rose by Rs 50 per quintal at the wholesale oils and oilseeds market today due to pick up in demand from Vanaspati millers. Castor oil, in the non-edible section, also strengthened on increased offtake by consuming industries. Rising demand from Vanaspati millers and retailers against restricted supplies from producing belts, mainly led to the rise in mustard and cottonseed oil prices.