Fig. 2

A Pig faeces of group one to six (period 6, day 5) receiving different material combinations: (a) powder-biochar, (b) powder-straw, (c) peat-biochar, (d) peat-straw, (e) biochar-straw, (f) powder-peat; B Thermograms of total ion intensity (TII) (inserts upper right) and pyrolysis-field ionization mass spectra of (a) feed, (b) peat and (c) faeces from pigs in a group receiving the material combination peat-straw; (d) shows the relative intensity of major peat marker molecular ions from Py-FI mass spectra of faces from pigs in the control groups (no material treatment) and all test groups receiving the material combination peat-straw; C Long-chain n-alkanes (25–36 carbon atoms) in feed, provided material (peat and straw) and faecal samples of pigs receiving no materials (Control faeces) and the material combination peat-straw (Faeces 1–6); D Acid insoluble ash in eight faecal samples of pigs receiving no material treatment (Control groups, sample 1 and 2) and the material treatment powder-straw (Test groups, sample 2–8)