Table 2.

The genus-level taxonomy of abundant core OTUs of the porcine fecal and nasal microbiotas

Age (days)	Genera of the core OTUs* of the porcine microbiotas (% of pigs with OTU)
	Fecal Microbiota	Nasal Microbiota
1	Escherichia (Shigella) (100), Clostridium sensu stricto (100)	Globicatella (100), Haemophilus (100), Clostridium sensu stricto (100), Rothia (80), Staphylococcus (80)
3	Clostridium sensu stricto (100), Clostridium XIVa (80), Haemophilus (80), Lachnospiracea incertae sedis (80)	Globicatella (100), Rothia (100), Haemophilus (80), Clostridium sensu stricto (80)
7	Clostridium sensu stricto (80), Clostridium XIVa (80), Desulfovibrio (80)	Clostridium sensu stricto (80)
14	Escherichia (Shigella) (100), Clostridium XIVa (80)	Clostridium sensu stricto (80), Kingella (80), unclassified Firmicutes (80)
21	None	Clostridium sensu stricto (100), Kingella (80), unclassified Firmicutes (80)
28	Megasphaera (80), Lactobacillus (80), Acidaminococcus (80)	Lactobacillus (100), Erysipelotrichaceae incertae sedis (100), Enterococcus (100), Haemophilus (80), Blautia (80)
35	Megasphaera (100), Lactobacillus (100), Butyricicoccus (100), Erysipelotrichaceae incertae sedis (80), Selenomonas (80), Roseburia (80), Acidaminococcus (80), Faecalibacterium (80), unclassified Firmicutes (80)	Lactobacillus (100)
42	Megasphaera (100), Butyricicoccus (100), Erysipelotrichaceae incertae sedis (100), Roseburia (100), Acidaminococcus (100), Faecalibacterium (100), Lactobacillus (80), Selenomonas (80), Streptococcus (80), Prevotella (80), Clostridium XI, unclassified Firmicutes (80)	Lactobacillus (100), Sarcina (100), Erysipelotrichaceae incertae sedis (80), Kingella (80), unclassified Firmicutes (80)
49	Megasphaera (100), Butyricicoccus (100), Erysipelotrichaceae incertae sedis (100), Roseburia (100), Lactobacillus (80), Streptococcus (80), Prevotella (80), Gemmiger(80)	Lactobacillus (80), unclassified Firmicutes (80)

* Present at >1 % relative abundance