This Letter presents the x and y distributions of events with visible strange particles produced in charged-current Vp interactions. It is shown that charmed-par tide production via the process V^s-~y?c is required. Using a simple model, we obtain, for the proton, jxs{x)dx = 0.007±0.002 and jx~s{x)dx/jxu{x)dx = 0.019± 0.006 in the kinematic region 0.05