Development of adrenergic and cholinergic receptor cardiovascular regulatory capacity in the Canada goose (Branta canadensis) and domestic goose (Anser anser domesticus)

Adrenergic control of cardiovascular function is a common component of regulation in embryonic birds studied to date. Our goal was to investigate adrenergic and cholinergic cardiovascular regulation in two goose species, the Canada goose (Branta canadensis) and the related domestic goose (Anser anser domesticus) to determine if these species possess similar regulation during embryonic development. We determined mean arterial pressure (P-m) and heart rate (f(H)) responses to serial blockade of cholinergic, beta-adrenergic and alpha-adrenergic receptors in B. canadensis and A. domesticus at 70 and 90% of total incubation (28 days). Both species possessed cholinergic and beta-adrenergic tone on f(H) at 70% of incubation that increased in intensity with development. In addition, a constant alpha-adrenergic tone on P-m was present in both species. Our findings indicate that these geese species possess both cholinergic and adrenergic cardiovascular regulation providing information needed for speculation regarding the commonalities in the ontogeny of these cardiovascular regulatory elements in birds. (C) 2013 Elsevier Inc All rights reserved.