  We study the momentum distribution of the electrons in an extended periodic
Anderson model, where the interaction, $U_{cf}$, between itinerant and
localized electrons is taken into account. In the symmetric half-filled model,
due to the increase of the interorbital interaction, the $f$ electrons become
more and more delocalized, while the itinerancy of conduction electrons
decreases. Above a certain value of $U_{cf}$ the $f$ electrons become again
localized together with the conduction electrons. In the less than half-filled
case, we observe that $U_{cf}$ causes strong correlations between the $f$
electrons in the mixed valence regime.
