  The results of magnetoresistance ($\Delta \rho /\rho$)measurements in GdNi,
in the temperature range 4.2 to 300 K are reported. The sign of $\Delta \rho
/\rho $ above the Curie temperature (Tc= 70 K) is negative and its magnitude in
a magnetic field of 80kOe grows with decreasing temperature below 150 K with a
peak value of about -20% at Tc. These features, qualitatively resembling those
in giant magnetoresistance systems (manganates), are attributed to the
formation of some kind of magnetic polarons induced by Gd. The
magnetoresistance changes sign below 12 K which is attributed to subtle band
structure effects.
