  Starting from the semi-analytic construction of a equation of state (EoS)
which takes into account nuclear and quark matter at finite temperature, we
study the possibility that proto-neutron stars, be proto-hybrid stars whose
cores are composed of quark matter. We obtain the mass-radius relationship and
discuss the latest constraints on masses and radii of neutron stars,
considering the pulsars PSR J1614-2230 and PSR J0348 + 0432.
