title: Changes in the adrenal steroidogenic responsiveness of the mallard duck (Anas platyrhynchos) during early post-natal development.
abstract: 1. Plasma concentrations of corticosterone (B), aldosterone (Aldo) and deoxycorticosterone (DOC) were measured in mallard ducklings immediately before and after exposure to acute immobilization stress. 2. Except for transient declines in B and DOC between the 4th and 14th days after hatching, the resting concentration of each hormone did not change significantly during post-natal development. 3. The stress-induced in Aldo was maximal at hatching while maximal increases in B and DOC did not occur until one day later. 4. Thereafter the magnitude of the stress-induced increases in the concentrations of all of the hormones decreased steadily and on the 21st and 28th days after hatching only B increased significantly in response to stress.
authors.affiliation: Department of Biological Sciences, University of California, Santa Barbara 93106.
authors.forename: W N
authors.initials: WN
authors.lastname: Holmes
authors.forename: J L
authors.initials: JL
authors.lastname: Redondo
authors.forename: J
authors.initials: J
authors.lastname: Cronshaw
mesh_terms: D000450:Aldosterone / Q000096:biosynthesis* / Q000097:blood; D000818:Animals; D003345:Corticosterone / Q000096:biosynthesis* / Q000097:blood; D003900:Desoxycorticosterone / Q000096:biosynthesis* / Q000097:blood; D004372:Ducks / Q000254:growth & development*; D005260:Female; D007103:Immobilization; D008297:Male; D013312:Stress, Physiological / Q000097:blood*
chemical_list: D003900:Desoxycorticosterone; D000450:Aldosterone; D003345:Corticosterone