  The effect of quark mass on the Regge trajectory is analysed. Modifications
in the equations of Regge trajectories are shown for mesonic as well as
baryonic systems. For mesonic systems, the Regge trajectories get modified, but
still remain linear. Contrary to the mesonic case, the Regge trajectories for
baryonic systems indicate non-linearity. It is shown that in low mass and
angular momentum region two hadrons with different quark compositions can have
same mass and angular momentum.
