The aim of the work is to study the effect of adsorbent "Vermiculite" and phytobiotic "Extract Ruminant " on the density of infusoria fauna of the rumen and on the milk productivity of cows. The object of the research is lactating cows. As a result of the research it has been revealed that inclusion of adsorbent "Vermiculite" and phytobiotic "Extract Ruminant" in the diets of dairy animals had a positive effect on the density of infusoria in the rumen, having increased their number by 52.3 15.4% compared to the animals of the same age in the control group. The use of feed additives contributed to the increase in milk productivity of cows by 4.1 – 3.8% in the 1st and 2nd experimental groups, respectively.
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