title: Heart rate changes with age in chickens.
mesh_terms: D000375:Aging; D000818:Animals; D001285:Atropine / Q000008:administration & dosage / Q000494:pharmacology; D002645:Chickens / Q000502:physiology*; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D007275:Injections, Intravenous; D008297:Male; D011433:Propranolol / Q000008:administration & dosage / Q000494:pharmacology; D013997:Time Factors
chemical_list: D001285:Atropine; D011433:Propranolol