Growth hormones and their relationship with the parameters of the erythrogram in the body of chicks

The variability of the concentration of growth hormones (GR, IGF-1), the main and calculated indicators of the erythrogram in heifers during the milk-plant growing period is characterized. It was found that the level of erythrocytes varies from 5.02±0.23 to 6.03±0.07 1012/l, hematocrit from 35.70±0.70 to 39.00±0.69 % and hemoglobin from 85.00±1.10 to 126.00±1.06 g/l. With age, in the statistical sample of an individual parameter, the scope of variation of the trait decreases, the coefficient of variation and the value of the standard deviation, reflecting the process of forming a balance between the mechanisms regulating erythrocyte homeostasis. The value of the average volume of erythrocytes decreases by 9.07 % under conditions of increased cell homogeneity in the population of erythrocytes of the bloodstream, since the indicator of anisocytosis, expressed both in vials and as a percentage, decreases by 6.04 and 2.93 %. The average level of hemoglobin in the erythrocyte increases by 25.00 %, which leads to a denser "packing" of protein in the red cell (MSNO increases by 35.71%). The level of growth hormone in the blood of heifers decreases by 46.34%, and the insulin-like growth factor type 1, on the contrary, increases more than 23 times, reflecting the peculiarities of biological relationships in a pair of growth hormone – IGF-1. At the same time, growth hormone does not directly affect the variability of erythrogram parameters in the blood of heifers, but regulates it through the biological effects of IGF-1. The concentration of IGF-1 significantly correlates with the level of hemoglobin (r= 0,67±0,25 - 0,72±0,24), and also to an average degree with the number of red blood cells (r= 0.53±0.31 - 0.59 ± 0.29) and the average hemoglobin content in the red blood cell (r= 0,57±0,29 - 0,61±0,27).