Prices of mustard seed rose in Jaipur owing to renewed demand from domestic stockists and oil millers after prices hit a one-week low. A fall in arrivals also supported prices. Arrivals in Rajasthan were estimated at 110,000 bags (1 bag = 85 kg) today, compared with 140,000 bags. However, weak export demand for mustard meal capped gains. On NCDEX, the most-active June contract was at 3,923 rupees per 100 kg, up 0.4%.