  A detailed study of the zero-field electrical resistivity and
magnetoresistance for the metallic members of the LaNi_{1-x}Co{x}O3 solid
solution with 0.3<=x<=0.6 is reported. The low temperature resistivity of the
compounds with 0.3<=x<=0.5 exhibits a logarithmic dependence that is
characteristic of systems with spin fluctuations. It is suggested that the
effect of the magnetic field dependence on the spin fluctuations plays a vital
role in determining the magnetoresistive behavior of these compounds. Concrete
experimental evidence that classify the chemically induced metal-to-insulator
transition (x_{c}=0.65) as a percolative phenomenon is provided. The
resistivity data for the x=0.6 metallic compound are analyzed in the framework
of cluster percolation threshold theory. The results of this analysis are
consistent with the suggestion that the growth of magnetic metallic clusters in
the presence of a magnetic field is mainly responsible for the observed giant
magnetoresistance effect at low temperatures for the compounds with x>=0.6.
