The article presents the results of the use of osprey as a non-traditional feed additive for its inclusion in the diets of cattle. The experiment was carried out on the basis of the breeding farm “Berezka” of the Alagir district of the North Ossetia-Alania on clinically healthy dry cows, formed into 2 groups (n=20). In the diets of cows of both groups, a cellulose-containing additive from the osprey in the amount of 9.5 kg was used, while the animals of the second group were additionally fed with dolomite (calcium carbonate) in the amount of 50.0 g. Under production conditions, the influence of a diet with the inclusion of an osprey on the physiological parameters of the body of cows and the biochemical homeostasis of blood was studied. It has been determined that the use of the additive does not have a negative effect on the body of pregnant cows, but according to some indicators of protein metabolism, it even exhibits an exchange-stimulating effect, characterized by a quantitative increase in the amount of free amino acids. At the same time, the inclusion of dolomite in the diet improves the nutritional value of the diet.