A biomass constituted of yeast and of lactic acid bacteria, which can be used directly as panification ferment without previous separation of the culture medium and the biomass, is prepared by cocultivating at least one strain of yeast and at least one strain of lactic acid bacteria in a mixed and/or sequential culture, in a culture medium specified in the description. Preferably, the said ferment comprises as yeast the strain Saccharomyces cerevisiae steineri DSM 9211 and as lactic acid bacteria one or several strains of Lactobacillus brevis DSM 9209, Lactobacillus plantarum DSM 9208, Leuconostoc mesenteroides DSM 9207 and/or Pediococcus pentosaceus DSM 9210.
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