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Abstract
The literature on congenital atresia of the small intestine in calves and lambs is briefly reviewed. Lesions resembling those described in clinical cases were produced experimentally by occluding the blood supply to the intestine in foetal lambs. Histological examination of the small intestine proximal to the induced atresia revealed a reduction in the length of the villi with distension of blood vessels and lymphatics. Distal to the lesion the intestine had a normal histological structure.