“…The damaging action of endogenous intoxication factors on the organism of cows is concentrated in three main directions, namely: in the form of stoppage of exchange processes due to delay in withdrawal or removal of the final product of exchange; in the form of switching synthetic processes to the production of nonphysiological compounds, down to the so-called "lethal synthesis", which leads to the appearance of excessively toxic substances in the internal environment; in the form of damage of cell membranes, which is the most harmful (Culbertson & Osburn, 1980;Boosman et al, 1991;Fabris et al, 2017;Bomko et al, 2018;Klosova et al, 2019). Modern ideas about the mechanism of action of endotoxins on the organism of cows are based on the leading role of antioxidant system in it (Luzhnikov et al, 2007;. Antioxidant system of animals protection is a powerful mechanism that prevents the development of so-called oxidative stress and avalanche-free radical and peroxide reactions in the organism (Khariv et al, 2016;Khariv et al, 2017;Gutyj et al, 2019;Rudenko et al, 2019).…”