  The cosmological baryon asymmetry can be explained as remnant of heavy
Majorana neutrino decays in the early universe. We study this mechanism for two
models of neutrino masses with a large \nu_\mu-\nu_\tau mixing angle which are
based on the symmetries SU(5) x U(1)_F and SU(3)_c x SU(3)_L x SU(3)_R x
U(1)_F, respectively. In both cases B-L is broken at the unification scale
\Lambda_{GUT}. The models make different predictions for the baryogenesis
temperature and the gravitino abundance.
