  Strangness production processes can balance natural strangeness decay in the
early hadronic Universe. Comparing to the characteristic Hubble time $1/H$, the
reaction rates for $\mu^\pm+\nu_{\mu}\rightarrow K^\pm$,
$l^-+l^+\rightarrow\phi$, and $\pi+\pi\rightarrow K$ in sequence become slower
than expansion rate at $T=33.9\,\mathrm{MeV}$, $T=25\,\mathrm{MeV}$ and
$T=20\,\mathrm{MeV}$ respectively. This means that in the antibaryon
annihilation epoch near to $T\simeq 40\,\mathrm{MeV}$ strangeness is in
chemical equilibrium.
