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The Kondo lattice model with Hund's ferromagnetic spin coupling isinvestigated as a microscopic model of the perovskite-type 3d transition-metaloxide La$_{1-x}$Sr$_x$MnO$_3$. In the classical spin limit $S=\infty$ and theinfinite-dimensional limit $D=\infty$, the one-body Green's function iscalculated exactly. Transport properties of the system in the presence ofmagnetic fields are calculated. The giant magnetoresistance of this model,which is in a good agreement with the experimental data ofLa$_{1-x}$Sr$_x$MnO$_3$, is explained by the spin disorder scattering process.Comment: 8 pages, 2 PS figures at the end, LaTeX, ISSP Tech.Rep. No. 284

Transport Properties of the Kondo Lattice Model in the LimitS=∞ andD=∞