摘要：In this study the growth and activity of bifidobacteria in mixed culture with Lactobacillus helveticus were evaluated in order to use the results in the technology of probiotic dairy products. Bifidobacteria and Lactobacillus helveticus used in this experiment were simultaneously inoculated in milk samples and afterwards at different times. In optimum conditions of incubation the growth rate of bifidobacteria and the changes that occurred in their medium were monitored. The populations of bifidobacteria in the variants of milk inoculated with Lb. helveticus after 5h from inoculation of bifidobacteria were higher than in variants simultaneously inoculated with the two cultures. The highest growth rate of bifidobacteria was achieved in variant of milk inoculated with bifidobacteria and Lactobacillus helveticus in the proportion of 6:2, where the population of bifidobacteria was 2.29 x 109 cfu/ ml.
