Abstract
In a 7-month experiment, rats sustaining DMH-induced tumorigenesis were on a dietary regimen supplemented with milk fermented using three different starters. The strains used were: Lactobacillus delbrueckii, spp. bulgaricus, LBD 5 (273 NBIMCC); Streptococcus thermophilus, S.t. 12 (450 NBIMCC); and the above two strains combined in a symbiotic starter for Bulgarian sour milk, provided from the ELBY Engineering-G collection.Ingestion of diets supplemented with fermented milk was found to substantially reduce DMH-induced tumorigenesis: from 71% of animals in the control group to 50% in the experimental groups. The mean number of tumors per animal was likewise lowered: from 1.8 for the control group to 0.8 for Gr.2, l.0 for Gr.3, and 1.0 for Gr.4.The dietary regimens with fermented milk supplements produced a decrease in the proportion of malignant neoplasms. The antitumor effect was noted to be species-specific.The evidence obtained is of preliminary nature. It calls for expanding the experimental studies to include a larger number of original Bulgarian strains and symbiotic cultures used in the dairy industry, with the ultimate objective to contribute to alimentary prevention of colonic cancer.
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