  We investigate the reconstruction of a Fermi surface, which is called a
Lifshitz transition, in magnetically ordered phases of the periodic Anderson
model on a square lattice with a finite Coulomb interaction between f
electrons. We apply the variational Monte Carlo method to the model by using
the Gutzwiller wavefunctions for the paramagnetic, antiferromagnetic,
ferromagnetic, and charge-density-wave states. We find that an
antiferromagnetic phase is realized around half-filling and a ferromagnetic
phase is realized when the system is far away from half-filling. In both
magnetic phases, Lifshitz transitions take place. By analyzing the electronic
states, we conclude that the Lifshitz transitions to large ordered-moment
states can be regarded as itinerant-localized transitions of the f electrons.
