Hormonal and morphological blood indicators of Hereford cattle of Canadian selection in adapting to the condition of Altai region

Imported cattle adaptation to new technological and climatic conditions depends on the functional activity of the endocrine system, which has a direct effect on red and white blood. In this regard, the aim of the research was to study the hormonal sta-tus and morphological parameters of Canadian Hereford cattle breed blood in Altai region. For the research, the serum was determined by ELISA con- tent of adrenal hormones (cortisol) and thyroid (thy-roxin, triodothyronine). The number of red blood cells and white blood cells was determined in a counting chamber of Goryaev, and by the level of hemoglobin - gemoglobin cyanide colorimetric method, as well as by conclusions of the leukogram smear of blood. The studies show that in the first month of the imported Canadian cattle adaptation, the selection in their blood for the entire study peri-od, maximum concentration of cortisol, equal to 93,2 ± 4,6 nmol/l, lowest thyroxin, equal to 51,9 ± 2,7 and triiodothyronine, equal to 1,21 ± 0,32 were observed. During this period, the number of studies of erythrocytes and leukocytes was within physio-logical range. The low level of hemoglobin was 94,05 ± 1,68 g/l. The leukogram of imported ani-mals was characterized by low number of eosinophils, monocytes, lymphocytes and high number of neutrophils. Also it was found out that the adaptation of Canadian animal breeding and the development of their pregnancy were accom-panied by increased functional activity of adrenal cortex and high metabolism of thyroid hormones. The morphological structure of blood in imported animals was within the physiological norm. The blood cells dynamics and hemoglobin correspond-ed to the physiological state of imported animals' body (pregnancy, lactation). The concentration of the studied hormones and morphological indicators of blood in imported cattle show good adaptability of their organisms to changing environmental con-ditions.