  We investigate the meson, baryon and anti-baryon productions in \pi p and Kp
collisions in terms of a constituent cascade model which includes charm
flavour. The constituent diquark in an incident baryon has a tendency to get a
large momentum fraction, resulting in considerable difference of subenergies
for particle productions from quark-diquark and quark-antiquark chains in a
meson-baryon collision. As a consequence, the leading particle effects on D
meson productions are expected to be quite different in \pi+ and \pi- beams at
present accelerator energies.
