The purpose of the research was to investigate the influence of various levels of proprebiotic preparation "Vitakorm-Bio" added to the mixed fodder for youth swine on their growth and nutrient digestibility. In order o carry it out, at the SE "Moldsuinhibrid", 12 pigs-analogous of Landrace breed were selected, which were divided into four experimental groups (CG, EG1, EG2 and EG3) of three head each. The dietary treatment included: 1) CG (main mixed fodder); 2) EG1 (main mixed fodder + 1.5 kg/t of Vitakorm Bio); 3) EG2 (main mixed fodder + 3.0 kg/t of Vitakorm Bio); 4) EG3 (main mixed fodder + 4.5 kg/t of Vitakorm-Bio). It was established that the supplementation of the mixed fodders for young pigs with the proprebiotic preparation "Vitakorm-Bio" had positively influenced the dynamics of their body mass; it was the highest in EG2 and EG3, in which the pigs were fed a diet supplemented with the preparation at the level of 3.0, and 4.5 kg/t respectively; the average daily gain was the highest in the group EG2 the level of preparation in which was 3.0 kg/t (0.248 kg; by 2.48% more than in CG). The supplementation of the fodder for the pigs in EG3 with the pro-prebiotic complex at the level of 4.5 kg/t improved their nutrient digestibility; in this group the indices were higher compared with the control group: of dry and organic matter, protein, cellulose and crude ash by 0.69, 0.05, 1.92, 0.71 and 7.42% respectively