  We calculate the baryon asymmetry of the Universe resulting from the
combination of higher-dimensional Lorentz-noninvariant CPT-odd operators and
dimension five operators that induce the majorana mass for neutrinos. The
strength of CPT-violating dimension five operators capable of producing the
observed value of baryon abundance is directly related to neutrino masses and
found to be in the trans-Planckian range 10^{-24}-10^{-22} GeV^{-1}.
Confronting it with observational tests of Lorentz symmetry, we find that this
range of Lorentz/CPT violation is strongly disfavored by the combination of the
low-energy constraints and astrophysical data.
