  The $\bar{\Lambda} / \Lambda$ and $\bar{\Lambda} / K^0_\mathrm{S}$ production
ratios are measured by the LHCb detector from $0.3\,\mathrm{nb}^{-1}$ of $pp$
collisions delivered by the LHC at $\sqrt{s} = 0.9$\,TeV and
$1.8\,\mathrm{nb}^{-1}$ at $\sqrt{s} = 7$\,TeV. Both ratios are presented as a
function of transverse momentum, $p_\mathrm{T}$, and rapidity, $y$, in the
ranges {$0.15 < p_\mathrm{T} < 2.50\,\mathrm{GeV}/c$} and {$2.0<y<4.5$}.
Results at the two energies are in good agreement as a function of rapidity
loss, $\Delta y = y_\mathrm{beam} - y$, and are consistent with previous
measurements. The ratio $\bar{\Lambda} / \Lambda$, measuring the transport of
baryon number from the collision into the detector, is smaller in data than
predicted in simulation, particularly at high rapidity. The ratio
$\bar{\Lambda} / K^0_\mathrm{S}$, measuring the baryon-to-meson suppression in
strange quark hadronisation, is significantly larger than expected.
