Abstract
The foramen ovale closed prematurely in two calves-(case 1) a Holstein-Japanese Back crossbred female nine days old and (case 2) a Japanese Black female 11 daysold. In case 1, the heart, had a ventricular septal defect and a double-outlet right ventricle with no hypoplasia of the left ventricle. The heart of case 2 demonstrated left atrioventricular-valve atresia, and the left ventricle was observed to be a minute myocardial mass.
