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The effect of the probiotic strain Bacillus cereus var. toyoi on enterobacterial growth and selected metabolic parameters in digesta samples from piglets before and shortly after weaning was studied. Growth capacities of enterobacteria in digesta samples were significantly reduced, but no correlation was found between enterobacterial growth and concentrations of short-chain fatty acids and lactic acid, which are often influenced by other probiotic preparations. Tendencies for higher amounts of short-chain fatty acids were only recorded in digesta samples from the end of the jejunum, caecum and colon from piglets receiving probiotic-supplemented feed. Lactic acid concentrations were reduced by the presence of B. cereus var. toyoi in feed in the first segment of the jejunum during the suckling period, while samples of the lower parts displayed an increased amount 4 days after weaning. Microbial activity of taurocholine deconjugating enzymes was significantly reduced in jejunum digesta from probiotic-fed piglets. There are strong indications that the early uptake of already modified microbial populations from faeces of the mother sow aids modification of intestinal microbial communities and their metabolic activities in piglets.