Single ventricle, total transposition, and hypoplastic aorta in a calf.

A purebred Ayrshire calf was born with multiple congenital cardiac defects. The major defects included absence of an interventricular septum (i.e., single ventricle), transposition of the aorta and pulmonary trunk, interatrial septal defect, patent ductus arteriosus, and aortic arch anomalies. Despite the severity of the anomalies, the calf survived to 5 days of age, when it was found dead. This particular combination of cardiac defects has not been previously described in domestic animals.