Table 3a

		Stomach			Ileum
Order	Genus	Low	Medium	High	Low	Medium	High
Clostridiales	Clostridium	3.2 (±0.9)^a	6.6 (±1.2)^ab	8.4 (±1.3)^b	1.7 (±0.5)^a	6.5 (±1.3)^a	33.4 (±18.1)^b
Bacteroidales	Prevotell^a	0.21 (±0.15)^a	7.5 (±2.8)^b	0.88 (±0.72)^a	1.6 (±2.9)	1.1 (±1.4)	0.45 (±0.72)
Enterobacteriales	Citrobacter	n.d.	n.d.	n.d.	0.61 (±0.34)	0.27 (±0.22)	0.41 (±0.14)
	Enterobacter	n.d.	n.d.	0.08 (±0.05)	1.1 (±0.4)	0.05 (±0.03)	0.16 (±0.14)
	Escherichia/Shigella	0.04 (±0.01)	0.06 (±0.03)	0.37 (±0.29)	4.2 (±1.8)^a	3.52 (±2.1)^a	7.4 (±2.5)^b
	Pantoea	0.03 (±0.01)^a	0.05 (±0.04)^a	0.19 (±0.15)^b	n.d.	0.07 (±0.05)^a	0.23 (±0.05)^b
Lactobacilliales	Lactobacillus	79.4 (±16.4)^a	68.9 (±19.2)^a	44.3 (±16.8)^b	67.9 (±21.8)^a	55.6 (±12.5)^a	36.5 (±9.9)^b
	Lactococcus	0.37 (±0.33)	0.90 (±0.82)	0.07 (±0.02)	n.d.	0.29 (±0.14)	n.d.
	Streptococcus	0.05 (±0.03)^a	0.081	0.11 (±0.09)^b	n.d.	n.d.	0.09 (±0.02)
Pasteurellales	Actinobacillus	0.11 (±0.13)^a	0.22 (±0.27)^a	12.5 (±11.4)^b	2.3 (±10.5)	1.5 (±1.4)	1.4 (±1.7)
Selenomonadales	Acidaminococcus	0.80 (±0.52)^a	0.99 (±0.58)^a	2.2 (±1.3)^b	1.3 (±0.8)	1.3 (±1.0)	0.13 (±0.03)
	Dialister	0.58 (±0.11)^a	0.67 (±0.31)^a	1.28 (±0.21)^b	1.5 (±1.9)	0.75 (±0.73)	1.14 (±1.3)
	Megasphaera	6.8 (±3.1)^a	7.5 (±2.5)^a	15.0 (±4.9)^b	7.6 (±3.8)	9.8 (±4.2)	2.7 (±2.0)
	Mitsuokella	4.3 (±0.4)	1.8 (±2.4)	4.1 (±5.2)	7.7 (±6.2)	8.2 (±10.7)	8.1 (±11.1)
	Selenomonas	4.5 (±1.4)^a	2.6 (±2.2)^a	7.9 (±2.1)^b	4.5 (±3.1)^a	8.4 (±3.3)^ab	10.4 (±5.5)^b
	Veillonella	0.06 (±0.02)^a	0.11 (±0.15)^ab	1.4 (±0.4)b	2.0 (±1.2)	0.40 (±0.49)	1.7 (±2.1)

a,b = significantly different within rows and intestinal segment (Mann-Whitney-U test; P ≤ 0.05)
1 = single value

Table 3a: Core microbiota in the small intestine of 32d old piglets fed diets with different dietary ZnO concentrations [% of total reads].