SUMMARY

In the paper investigations of weaned piglets are performed. Piglets were divided in to 2 groups and fed diet mixture, balanced and difference was only in concentrations of probiotic Paciflor C-10. Control group of piglets was fed diet standard content, according to the farm technology, and in a diet of second group probiotic was added, whose concentration in the mixture was 0,015%. During 45 days trial, production parameters, body mass, daily gain, and food conversion ratio was determined. Body mass of control group piglets, at the end of experiment was 25,75 kg, for 1,01% lower than the body mass of piglets from experimental group, which were weighty 26,01 kg. Daily gain in the control group was 0,392 kg and in experimental group 0,398, higher 1,38%. Shown differences were not statisticaly significant. For kg of growth control group of piglets consumed 2,51 kg of food, 1,46% lower comparing to the experimental group of piglets, which are consumed 2,55 kg.

Summarizing experimental results, which are representing extension of earlier investigations, we can conclude absence of positive probiotic effect on production results of weaned piglets when is concentration over some optimal concentration, which is, as a result of our investigations, on 0,01%.

          Key words: weaned piglets, probiotic, Paciflor C-10, body weight, dayli weight gain, body growth, feed conversion, feed cosumption, feed consumption for kg growth.