SUMMARY This retrospective study presents the results of surgical treatment of obstructive colic in horses operated in the last decade (1976)(1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985). The overall short-term recovery rate (i.e. discharged from hospital) was 51% of casespresented for surgery, and 68% of cases which were considered to be amenable to surgical therapy. For long-term results (6 months -8 years follow up) these percentages must be reduced by about 15% due to mortality after discharge. Special attention has been given to surgery of the ileum, which is often involved in strangulation or obturation, and accounts for about 26% of gastrointestinal surgical disorders. The long-term recovery rate of ileal surgery was 54.3%, but ileocaecal intussusception and jejunocaecostomy with resection have a much poorer prognosis. The results of this study indicate that resection of the ileum should be avoided unless necrosis is present or threatening. The alternative is creation of a shunt between (distal) jejunum and caecum, thus bypassing the ileum and ileocaecal junction and preserving the original anatomical relationships.