The BHT. (butylatedhydroxytoluene, a commercially used antioxidant) was supplied by
Sigma-Aldrich. The herbal extract was a mixture of water extracts from
sage (Salvia officinalis), nettle (Urtica dioica), lemon balm (Melissa
officinalis) and coneflower (Echinacea purpurea) in a w/w ratio of
40:20:20:20, respectively. Extracts were supplied by Phytopharm Ltd., Nowe Miasto nad Wartą, Poland. In each group half the animals (10
pigs, i.e., 5 barrows and 5 gilts) received 4% rapeseed oil, the second half
soybean oil.