Occurrence of bacterial groups in faecal samples of pigs fed the control diet or diets supplemented with 1% grape seed and grape marc meal extract (GSGME) or 1% spent hops (SH), determined by qPCR (log
16S rRNA gene copy number/g fresh matter). Bars represent mean ± SD of 16 pigs per group. *Significantly different from control (P < 0.05). #Tended to differ from control (0.05 ≤ P ≤ 0.10).