Futures contracts of mustard seed are down on the NCDEX as investors booked profits after prices rise to a two-week high in the previous session. Prices rise because of the increase in demand from domestic oil millers and crushers. The most-active June contract of mustard seed on the NCDEX is down 1.1%. For the week, mustard seed futures are likely to trade positively on expectation of rise in demand ahead of Ramzan and from pickle industry.