Stress-induced Adrenal Steroidogenesis in Neonate Mallard Ducklings and Domestic Chickens : Endocrinology

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Stress-induced changes in adrenal steroidogenesis were compared in Mallard ducklings and domestic white leghom chickens on emergence at the end of embryogenesis. The effects of restraint, and restraint preceded by blood sampling, on the plasma corticosterone, aldosterone and deoxycorticosterone concentrations in each species were used to assess and compare these responses . A hypophysiotropic reflex capable of stimulating a responsive adrenal steroidogenic tissue is fully developed in newly-hatched ducklings. Restraint, and not hemorrhagic shock associated with taking a blood sample, is the major factor responsible for evoking the stress-induced increases in corticosterone, aldosterone and deoxycorticosterone release . The responses of the newly-hatched chicken to restraint, and to restraint preceded by bleeding, were qualitatively similar to those of the ducklings. In contrast to the duckling, however, hemorrhagic shock was more effective than restraint in causing an increase in plasma corticosteroid concentration. These data indicate that at least some of the sensory pathways responsible for the activation of the hypophysiotropic reflex in the chicken are fully functional at the time of hatching; this observation is contrary to that of other investigators who have concluded that the hypotbalamo-hypophyseal system is incapable of stimulating adrenal steroidogenesis during the first few days of post-natal life.
社団法人日本動物学会の論文
1990-08-15

Stress-induced Adrenal Steroidogenesis in Neonate Mallard Ducklings and Domestic Chickens : Endocrinology

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