The objective of this in vitro study was to compare fermentation patterns of seven selected traditional medicinal plants and investigate the effects of medicinal plant mixture (MPM) supplements and a high-concentrate diet (lucerne hay and barley grain, LH+BG, 40:60) on rumen fermentation and fatty acid composition. An MPM of Taraxacum officinale L., Acorus calamus L., Calendula officinalis L., ...