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ACTH stimulation of glucocorticoids in duck. ACTH caused a significant increase in (A) corticosterone and (B) cortisol compared to saline control, albeit in different patterns of release. Further, a significant sex difference was observed with hens showing increased cortisol, but not corticosterone, compared to drakes, although drakes did show an increase at 2 h. *** = sex difference in GC levels at P < 0.001, letters indicate statistically different groups at P < 0.05.
