Mustard seed prices were down Rs 25 to Rs 3,745 per quintal in futures trading today after participants preferred to lock in gains at current levels.
Besides, a weak trend at the domestic spot markets due to low demand too weighed on prices.
At the National Commodity and Derivative, mustard seed for delivery in June contracts edged lower by Rs 25 or 0.66 per cent to Rs 3,745 per quintal, revealing an open interest of 70,990 lots.
Mustard seed for delivery this month also lost Rs 16 or 0.43 per cent to Rs 3,723 per quintal, showing an open interest of 950 lots.
Marketmen said profit-booking at existing levels by speculators and a weak trend at the spot markets on withdrawal of buying support against increased supplies, mainly kept pressure on mustard seed prices in futures trade here.