“…Louw et al (1955) demonstrated in the dog that congenital atresia of the small intestine was caused by mesenterial circulatory impairment. In other species of mammals, many embryonal experimental operations have been carried out for analyzing the mechanisms of intestinal atresia (lamb, Pickard et al, 1981, Doolin et al, 1987; rabbit, Wesson et al, 1984), gastroschisis (rabbit, Aoki et a!., 1980Aoki et a!., , 1981, diaphragmatic hernia (sheep, Soper et al, 1984), and of obstructive jaundice (rabbit, Kawarasaki, et al, 1981) with some success.…”