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Effects of stress and ACTH on plasma corticosterone levels in the caiman Caiman crocodilus

1976; Elsevier BV; Volume: 28; Issue: 4 Linguagem: Inglês

10.1016/0016-6480(76)90149-0

1095-6840

Daniel H. Gist, Marvin L. Kaplan,

Aquaculture disease management and microbiota

Corticosterone levels in blood plasma of the caiman were measured in response to the collection of blood and to the administration of mammalian ACTH. Blood collection resulted in an increase in plasma corticosterone levels; the highest levels of corticosterone were observed 2 hr after the initial sample, and corticosterone levels declined thereafter despite continued blood collection. Prior treatment of caimans with dexamethasone abolished the response to blood collection. Administration of mammalian ACTH to dexamethasone-treated caimans resulted in elevated corticosterone levels. The levels of corticosterone measured in plasma did not vary with the amount of ACTH administered, but the duration of the steroidogenic response was dose-dependent.