عنوان مقاله [English]
During six years (1993-1999) nine Holstein calves were diagnosed with intestinal (colon and ileum) atresia and atresia ani in dairy farms around Tehran. Out of nine calves, two calves were diagnosed with atresia ani, two calves had atresia ani and lack of tail, one calf in addition to atresia ani had fifth limbs. The remaining four calves afflicted with segmental atresia cob and ilei. Only one case treated surgically, but died after one day. Four calves were culling from herd and four calves were necropsied.