  Transport properties of itinerant electrons interacting with local spins are
analyzed as function of the bandwidth, $W$, the exchange interaction, $J$, and
the band filling, $n$, near the band edge. Numerical results have been obtained
within the dynamical mean-field approximation and interpreted with the help of
analytical treatments. If spatial correlations of the magnetic fluctuations can
be neglected, and defining $\rho (m)$ as the magnetization dependent
resistivity, we find that $\delta \rho / \rho (0) \sim n^{-4/3}$ for $J / W, n
\ll 1$ (weak coupling, low density limit), $\delta \rho / \rho (0) \sim
constant$, for $J / W \gg 1, n \ll 1$ (double exchange, low density limit),
where $\delta \rho = \partial \rho / \partial m^2 |_{m^2 \to 0}$. Possible
limitations from ignoring both localization effects and critical fluctuations
are also considered.
