The December vaida was down while the January vaida was unchanged on the forward cottonseed oilcake market on Saturday in process of trading, dealers said. The December vaida that had closed at Rs 448.90 opened with a loss of 40 paisa at Rs 448.50 in process of trading, they said. The January contract which ended inert at Rs 989.00 and no change was seen at the early hours, they said.