  Mass dependences of the total production rates per hadronic Z decay of all
light-flavour hadrons measured so far at LEP are extrapolated to the zero mass
limit (m=0) using phenomenological laws of hadron production related to the
spin, isospin, strangeness content and mass of the particles. The
vector-to-pseudoscalar and meson-to-baryon ratios at m=0 are found to be: rho^+
/ 3 pi^+ = 1.2 +/- 0.3 and pi^+ / p = 2.9 +/- 0.3, in good agreement with the
predictions of quark combinatorics.
