The authors consider the second-order nonlinear delay dynamic equation
on a time scale. By employing a generalized Riccati transformation of the form
they establish some new sufficient conditions which ensure that every solution oscillates or converges to zero. The obtained results improve the well-known oscillation results for dynamic equations and include as special cases the oscillation results for differential equations. Some applications to special time scales with and four examples are also included to illustrate the main results.