The authors describe in 321 of 170 000 examined slaughter pigs certain
cardiac malformations which were associated with endocardiosis of the
mitral valve. Aortic stenosis was associated with endocardiosis of th
e aortic valve. It is assumed that in certain breeds of swine a congen
ital predisposition for impairment of the collagen metabolism may supp
ort the development of endocardiosis.