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Microbial OTU Venn diagram in fecal samples of growing pigs as affected by different ratio of fermented corn germ meal (FCGM) replacing soybean meal in diet. FCGM0, FCGM10, FCGM20 and FCGM30 diets were made by substituting FCGM for 0%, 10%, 20% and 30% soybean meal (n = 6). OUT = operational taxonomic units.
