in the system of complete feeding of dairy cows, the energy supply of animals is of paramount importance. The basis of the diet of ruminants is voluminous feed. However, they cannot fully provide highly productive cows with sufficient nutrients and energy. A particularly busy lactation period is a new lactation period, when the high energy costs of milk production cannot be fully covered by the nutrients from the feed. Therefore, as a rule, in the new body period, highly productive cows use a concentrated type of feeding in order to increase the level of metabolic energy in the dry matter of the diet.