A two-stage experiment was conducted in order to study the effect of a combined premix on blood morphological parameters. At the first stage, 20 healthy dairy cows were selected and divided into two groups: control and experimental, 10 animals in each. The control group of animals was fed with a standard diet adopted at the livestock complex, the experimental group – with a diet with the addition of a combined premix, at a dose of 300 mg/kg. At the second stage, 20 lactating dairy cows with subclinical mastitis were selected and divided into two groups: the first experimental and second experimental groups, 10 animals in each. The first experimental group was subjected to the generally accepted treatment regimen for inflammation of the mammary glands, while the second experimental group additionally received a combined premix. The results of hematological studies in animals were recorded on days 1; 30 and 60, in order to determine the level of the most significant blood elements. The results of the study show that at the first stage of research the combined premix affects the level of leukocytes, lymphocytes, monocytes, neutrophils and other immune cells in the blood of healthy cows, but does not have a significant effect on the levels of red blood cells, hemoglobin, platelets, compared with the control group. At the second stage of research, in animals with subclinical mastitis, the combined premix reduces the number of red blood cells, hemoglobin and platelets, as well as the number of neutrophils and leukocytes. Thus, the combined premix has a pronounced effect on clinical blood parameters in dairy cattle.

Lashin Anton P., Maksimov Nikita I., Chubin Aleksei N.

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