Abstract
The article analyzes the seasonal dynamics (winter, summer) of morphological and biochemical blood indicators characterizing the adaptive plasticity to the external environment of steers of locally improved livestock, Aberdeen-Angus, Kazakh white-headed and Kalmyk breeds, grown after weaning from mothers at the age of 8 months at an open feedlot of industrial type, located in a mountainous area within 1600 m above sea level. It was found that gobies of specialized meat breeds in all seasons of the year were characterized by greater blood saturation with red blood cells and hemoglobin and had an advantage over local improved cattle in terms of the content of total protein, albumins and globulins in blood serum.
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