EN
Studies were caried out initially on 5 sheep aged 2-4 years, about 40-45 kg body weight, and later on 30 young ewes aged 3.5-12 months. Sheep were fed hay (50%) and concentrates (50%) according to the feeding standards. The samples of rumen content were taken 2.5 hrs after morning feeding. The results obtained in the experiments showed an inhibitory effect of dried black livex on methane production. Livex also caused the increase of both total protein amount and the energetic value of the rumen content. The effect of dried black livex on the course of rumen fermentation in vitro was stronger than brown, dried livex (modified by whey).