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DEACARIZATION-ASSOCIATED DYNAMICS OF GLUCOCORTICOIDS AND THYROID HORMONE IN HENS AFTER DERMANYSSOSIS

The study of the sanogenetic mechanism implementation and the adaptation of
the body to extreme factors at the same time are hot topics for modern biology,
physiology, and parasitology, as well as for poultry industry. Poultry is exposed to
a whole range of extreme stress factors in the industrial sector. A special group is
biological stressors, in particular, hematophagous ectoparasites D. gallinae. Studies
conducted on High-Line laying hens on an industrial poultry farm showed that
the cortisol concentration increased significantly in their blood by 3.6 (p<0.001)
in dermanyssosis as compared to the control values. At the same time, the free
triiodothyronine concentration in the experimental birds was significantly lower by
14.5% (p<0.001) as compared to the control. After the poultry building deacarization
with the working emulsion 5% D-Cyphenothrin Emulsion of the drug, changes were
detected in the hormonal supply of the hens from the experimental group. Thus,
after dermanyssosis, they found an increase in the activity of follicular cells of the
thyroid gland and a decrease tendency in the function of the adrenal glands that
produces cortisol as compared to the control group. The described changes in the
hormonal supply of the experimental hens’ organism indicate the activation of
biophysiochemical recovery mechanisms of the birds’ organism and a tendency to
optimize their homeostasis.