The charged-particle production ratios p/p ¯ ,
K−/K+, π−/π+, (p+ ¯p)/(π+ +π−), (K+ +K−)/(π+ +
π−) and (p + ¯p)/(K+ + K−) are measured with the LHCb
detector using 0.3 nb−1 of pp collisions delivered by the
LHC at √s = 0.9 TeV and 1.8 nb−1 at √s = 7 TeV. The
measurements are performed as a function of transverse momentum
pT and pseudorapidity η. 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 p/p ¯ is also considered as a function
of rapidity loss, y ≡ ybeam − y, and is used to constrain
models of baryon transport.