[en] By developing Carr's analysis of primordial black hole formation, detailed evolutionary cosmological models have been constructed in which the black hole spectrum is fixed by the choice of density fluctuations imposed at the Planck time. The models are examined in the light of grand unified theories of elementary particles in which X-bosons, produced both thermally and by black hole evaporation, decay, giving rise to a non-zero baryon number. The fluctuations used are of the metrical or statistical type. In the first case, it is very difficult to find models in which a black hole population large enough to produce a significant baryon excess does not also severely upset the standard big bang at later times. In the second case, the black hole population dies out fairly rapidly, but under most initial conditions survives beyond the epoch when X-bosons become decoupled, and may therefore play an important part in generating a cosmological baryon excess. (author)