A feed composition containing at least oneimmunoactive agent selected from the group consisting ofsterilized bacterial cells, disrupted cell fragments obtainedfrom the cells and cell wall component-containing fractionsobtained from the disrupted cell fragments, is fed topregnant mother sows so as to reduce the percentage ofpiglings which die during birth or breast-feeding and toprevent the born piglings from having diarrhea, therebypromoting an increase in the weight of the piglings duringthe breast-feeding period.
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