Summary.Tests of surgical treatments (graft of small intestine, and partial enterectomy before or after irradiation) and dietetic treatments (continuous parenteral feeding) were carried out on 80 pigs irradiated over the posterior half of the body with doses of between 950 and 1750 rad at mid plane.The results relate to clinical symptoms, survivals, haematology, and histopathology; nutritional aspects were studied by means of evaluation of balances (nitrogen, lipids, and minerals) and absorption tests (58Co -Vit. B 12 and iodised lipids).Above 1200 rad recuperation of the digestive system did not in general make prolonged survival possible; in addition to intestinal lesions, renal and especially pancreatic atrophy appeared, whose consequences appeared to be determinative as regards the nutrition and hence the survival of the animals.