  The charged-particle production ratios $\bar{p}/p$, $K^-/K^+$, $\pi^-/\pi^+$,
$(p + \bar{p})/(\pi^+ + \pi^-)$, $(K^+ + K^-)/(\pi^+ + \pi^-)$ and $(p +
\bar{p})/(K^+ + K^-)$ are measured with the LHCb detector using $0.3 {\rm
nb^{-1}}$ of $pp$ collisions delivered by the LHC at $\sqrt{s} = 0.9$ TeV and
$1.8 {\rm nb^{-1}}$ at $\sqrt{s} = 7$ TeV. The measurements are performed as a
function of transverse momentum $p_{\rm T}$ and pseudorapidity $\eta$. The
production ratios are compared to the predictions of several Monte Carlo
generator settings, none of which are able to describe adequately all
observables. The ratio $\bar{p}/p$ is also considered as a function of rapidity
loss, $\Delta y \equiv y_{\rm beam} - y$, and is used to constrain models of
baryon transport.
