[en] Measurements are reported of partial widths and forward-backward asymmetries in flavour-identified quark final states based on the full LEP1 statistics, corresponding to 3x10⁶ hadronic Z⁰ decays collected by the DELPHI experiment from 1992 to 1995. Particle identification provided by the Ring Imaging Cherenkov counters and the Time Projection Chamber is used to obtain clear D⁰, D⁺, D_s⁺ and Λ_c⁺ signatures. A measurement of the charm multiplicity in bb-bar events is also presented. Identification of high-energy charged kaons is used to tag the s quark. Two methods for determination of the forward-backward asymmetry of the s quark are presented