The aim of the study was to estimate if addition of yeast product B.T. (Biertreber) to pregnant and lactating sows will be by colostrums and milk health and growth stimulater for piglets. The experiment was carried out on 30 multiparous crossbreeds wbpxpbz sows divided into 2 groups (15 animals in each). Sows from I (control) group were given from mating to the end of lactation period experimental mixtures LP and LK without any additives. Sows from the II (experimental) group were given the same experimental mixtures, but LPwith additive of 5% B.T. yeast and LK with additive of 4% of B.T. yeast. All piglets were given the same prestarter mixture from the 21st (weaning) to 45th day of life. Additive of B.T. yeast to pregnant and lactating sows brought same production profits. In the experimental group there were born and reared more piglets. These piglets obtained higher daily gains, were healther and there was stayed higher immunological status.

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