Fig. 8

Schematic overview of the three experimental housing conditions. Grey pens are +MCFA, white pens are –MCFA. a Housing condition 1 (H1) is a grow-out feed trial facility, with mesh panels separating pens. Only the 10 pens with a dot were individually followed and sampled for 16S rRNA gene amplicon sequencing. b Housing condition 2 (H2), an extensively cleaned floor stable with different distances between the pens and adjacent pens separated by solid wooden panels, with only a mesh panel at the front of the pen. c Housing condition 3 (H3), isolators, high biosecurity level and protected from environmental contamination