The zeroth-order general Randi\'{ c} index $R^{ 0}_{ a+1}$ of an $n$-vertices oriented graph $D$ is equal to the sum of $(d^{ +}_{ u_i})^{ a}+(d^{ -}_{ u_j})^{ a}$ over all arcs $u_iu_j$ of $D$, where we denote by $d^{ +}_{ u_i}$ the out-degree of the vertex $u_i$ and $d^{ -}_{ u_j}$ the in-degree of the vertex $u_j$, $a$ is an arbitrary real number. In the paper, we determine the orientations of cacti with the maximum value of the zeroth-order general Randi\'{ c} index for $a\geq 1$.
Categories: math.GM