[Problem] To provide a new intestinal muscle layer thinning preventing/treating composition, diarrhea preventing/treating composition, and weaning stress alleviating composition. [Solution] The present invention was achieved after confirming that a composition containing at least a lactic-acid bacterium (particularly, Streptococcus faecalis), a butyric-acid bacterium (particularly, Clostridium butyricum), and a saccharifying bacterium (particularly, Bacillus mesentericus) can reduce weaning stress by suppressing atrophy and increasing height of villi of intestinal tissues, suppressing thinning of intestinal muscle layers, preventing diarrhea after weaning, and improving intestinal health state.
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