EN
A probiotic Acid-Pack-4-Way produced by Alltech Center was administrated in a industrial farm: 636 piglets aged 4 weeks received the drug at the rale of 400 g per 100 kg of fodder (Grower) for 14 days. After 6 weeks it was found that 11.6 per cent of the animals in the experimental group were retarded in growth while in a control group receiving tylosin and furan after weaning the percentage of such piglets was 31.9. However, the death rate was higher in this group, Le. 11.7 per cent compared with 9.2 per cent in the control one. The probiotic was administred to 1334 pigs aged 3 months for two weeks at a dose of 400 g per 100 kg of dry fodder. Losses in the experimental group were 3.1 per cent and in the control 17.0 per cent although they received ronidasole during the adaptation period. The percentage of pigs with retarded growth was 22.5 in the experimental group and 30.8 in the control group. The cost analysis showed that the use of the probiotic in the period of pigs’ translocation was profitable.