It is an object of the present invention to reduce the percent mortality of piglets born from sows but died during childbirth and lactation, by feeding the composition of the present invention to the pregnant sows and reducing the number of piglets that suffer from diarrhea during lactation. Decrease the weight of the growing piglets.;One or more components selected from the group consisting of sterile bacterial cells, cell wall component-containing fractions obtained by fractionating broken cell fragments obtained by mechanically breaking down or enzymatically digesting these cells; Feed compositions are fed to pregnant sows to reduce the percent mortality during the birth or lactation of piglets born therefrom and to prevent diarrhea of the born piglets, thereby increasing the weight of piglets during lactation.
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