Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
ABSTRACT. The aim of the work was to systematize data on the relationships of morphological and hormonal parameters of peripheral blood in the early postnatal ontogenesis of broiler chickens in industrial technology using complex hemato-hormonal indices. In order to characterize their age dynamics, four groups of broiler chickens Hubbard F15 were formed from the industrial herd, 10 chickens each. At the age of 1, 7, 23 and 42 days the parameters of the cellular composition, the content of ACTH and cortisol in the peripheral blood were determined. The obtained data were compared with the dynamics of hemato-hormonal indices, compiled on the basis of the numbers of erythrocytes (E), heterophiles (H), lymphocytes (L) and cortisol (C) in blood: erythrocyte-lymphocyte (ELI, E/L), erythrocyte-heterophilic (EHI, E/H), erythrocyte-lymphocytic-cortisol (ECI, [(E/L)*C]/100), erythrocyte-heterophilic-cortisol (EHCI, [(E/H)*C]/100) and the integral index of erythrocytes-heterophyll-lymphocytes and cortisol (EHLCI, [((E+H)/L)*C)]/100). The ELI index after reaching the greatest decrease at 7 d (P<0.001 in relation to 1 d) increased to 42 d (P<0.001), EHI increased significantly at 7 d, decreased at 23 d (P <0.001) and increased again in a period to 42 d (P<0.001), with a significant increase in EHCI in the period from 1 to 7 days (P<0.001). The index of EHLCI showed a significant decrease in the periods from 1 to 7 days (P<0.001), with a significant rise at the age 7-23 d (P<0.001) correlating with a decrease in survival. Concluded that in the periods of early postnatal ontogeny, a cumulative adaptation process is formed, repeating in general, the reactions in the bone marrow, lymphoid organs and peripheral blood that constitute the physiological basis for the development of the general adaptation syndrome. At the same time, the anabolic character of the metabolism and nonspecific adaptation reactions mediates the formation of a functional system of adaptive homeostasis in early postnatal ontogenesis of broiler chickens
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