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The article presents results of studies on correction of silage and haylage rations of young fattening cattle and lactating cows by using sorbing, sorption- probiotic and antioxidant vitamin and mineral supplements. The application of such feed additives as Koretron and Biokoretron-forte in hay rations of fattening cattle in the amount of 1.1 % of its dry matter stimulates protein-synthesizing liver function, which is shown by concentration increase of total protein in blood serum of young animals in the experimental groups compared to the control (by 3, 97 and 5.01 %) albumin (6.21 and 9.34 %) and alpha globulins (9.26 and 16.74 %), concentration increase of immunoglobulins of A, M, G classes, all these parametres are reflected in an increase of average daily gains by 11.75 and 14.73 %. Adding the antioxidant vitamin and mineral supplement Lipovitam-beta to silage rations of cows at a dose of 4 g every 5 days increases their productivity by 7.41 %, which is also confirmed by an increase of serum protein concentration in their blood (by 2.04 %), besides, there is a significant increase of globulins by 3.52 % in the fractional spectrum, the fraction increase of gamma globulins (by 4.69 %), which carry the main load for formation of antibodies, is especially pronounced. The application of Lipovitam - beta has an immunostimulating effect during the period of late pregnancy of cows (7-8 months of pregnancy), which is confirmed by a significant increase of immunoglobulins of A, M and G classes in blood serum, by 8.38 %; 9.37 % and 13.01 %, respectively. Cow reproduction rates are improved

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