EN
The effect of selected nutritional factors on intestinal microflora was determined in two experiments with fatteners (experiment I - 18 animals, classified into three groups and experiment II - 14 fatteners, divided into two groups). In experiment I, the addition of a feed antibiotic - flavomycin, probiotic additive, containing bacterial strain Pediococcus acidilactici MA18/5M - and a prebiotic additive, containing cellular walls of yeasts Saccharomyces cerevisiae strain 1026, were employed. In experiment II, a low or high fiber level in the mixture was the experimental factor. Based on the performed post-mortem examination of intestinal contents, a favorable influence of Pediococcus acidilactici MA18/5M and Saccharomyces cerevisiae strain 1026 and of the high fiber level in the mixture on the quantitative and qualitative composition of intestinal microflora of fatteners was determined. The number of acidifying bacteria, including the potentially probiotic bacteria, increased and the number of bacteria from Enterobacteriaceae genus and potential pathogens decreased, which is a favorable phenomenon.