Introduction

Congenital defects, abnormalities of structure or function present at birth, may be caused by genetic or environmental factors, or a combination of both; in many cases, the causes are unknown. The most common bovine environmental teratogens include toxic plants consumed by the dam and maternal-fetal viral infections during gestation. Congenital malformation sometimes leads to perinatal mortality, and it may also decrease maternal productivity and reduce the value of the defective neonates. Severe defects results in abortion of the calf or a return to service of the calf and cow. Congenital anomalies have been estimated to occur in 0.2%–5% of calves1 .Atresia ani, (imperforate anus) is a congenital abnormality characterized by persistence of the anal membrane resulting in a thin membrane covering the normal anal canal or is the failure of the anal membrane to break down8 .Mereiet al. 7reported most congenital malformations was atresia ani and most frequently encountered in male calves and pigs. This report communicates a case of atresia ani in male calf, which was successfully treated by surgical intervention.