Table 3 Concentrations of volatile fatty acids (VFA) and pH value in faeces samples of weaned pigs fed a control diet or a diet supplemented with 1% grape seed and grape marc meal extract (GSGME) or 1% spent hops (SH)

Total VFA

581 ± 111

497 ± 90^*

524 ± 41^#

Acetic acid

332 ± 75

282 ± 64^#

310 ± 31

Propionic acid

141 ± 33

115 ± 21^*

120 ± 16^#

Isobutyric acid

10.4 ± 2.5

10.6 ± 2.3

11.8 ± 2.3

Butyric acid

66.1 ± 9.6

61.9 ± 18.5

53.5 ± 13.0^*

Isovaleric acid

12.9 ± 3.3

13.2 ± 3.9

13.5 ± 2.2

Valeric acid

17.7 ± 4.4

14.2 ± 3.7^#

14.8 ± 3.8^#

Faecal pH value

5.9 ± 0.1

6.2 ± 0.2^*

6.2 ± 0.3^*