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The effect of a spray-dried Spirulina platensis cyanobacterial biomass on the rate of acid development by various strains of major lactic acid producers in mesophilic dairy starter cultures, such as Lactococcus lactis subsp. lactis and Lc. lactis subsp. cremoris, was evaluated in cow's milk. The main objectives of this research were to determine the optimum concentration of the cyanobacterial biomass from a practical point of view, and to select Lactococcus strains whose acid production can be stimulated to a large degree by addition of the Spirulina biomass. Our results showed that 3 g/l of cyanobacterial biomass was optimal in regards to sensory properties and cost. Acid production of all the screened starter culture strains was stimulated significantly (p<0.05), although to varying degrees. In the case of both subspecies, the strain designated 89.07 gave the best results. The S. platensis biomass rich in trace …