Surgical Management of Atresia Ani in a Crossbred Calf

Atresia ani is a congenital defect that describes the absence of a normal anal opening. It is fatal unless a surgical  correction is carried out to provide an anal opening. In  female, the rectum may break through the vagina, forming  a rectovaginal fistula permitting defecation via the vulva.  Surgical treatment of atresia ani is indicated to save the  animal’s life and to improve body weight gain. Intestinal  atresia has been reported as a congenital defect in all  species of domestic animals (Gass and Tibboel, 1980). Atresia  ani may be caused by genetic disorders (chromosomes or  transgenesis), environmental factors, or a combination of  both (Cassini et al., 2005). Monsang et al. (2011) reported  a case of double vulva with atresia ani in a crossbred calf.  Atresia ani should be treated by a surgical operation to  solve the problem, improve body weight gain, and reduce  economic loss. The present report records a case of atresia ani  in a crossbred cow-calf and its successful surgical correction.