The May vaida was lower and the July vaida was unchanged on the forward cottonseed oilcake market on Tuesday in the process of trading, dealers said. The May vaida closed at Rs 1751.30 on Monday and it commenced with 30 paisa decline at Rs 1751.00 in the morning session, they said. The July vaida ended at Rs 1851.60 but it opened with no change in the early session, they said.