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Cortisol concentrations (ng/ml plasma). Cortisol concentrations (ng/ml plasma) measured in Large White (LW) and Meishan (MS) piglets either untreated (control) or 1 hour after injection (ACTH) of a high dose (250 μg per animal) of 1–24 ACTH (Immediate synacthen). (n = 6 per experimental group, means ± SE).
