Intussusception secondary to retroflexion of a proximal jejunal diverticulum, leading to Type 3 vagal indigestion with severe hypochloraemia in an adult Simmental bull (Bos taurus).

Intussusception is a rare but well‐described cause of intestinal obstruction in several species, including cattle, and is often associated with enteritis, intestinal parasitism or intestinal neoplasia. Clinical signs are non‐specific and include anorexia with reduced faecal output. This report describes a 4‐year‐old Simmental bull that presented with anorexia and reduced faecal output, along with severe ruminal bloat and a large, dilated intestinal loop palpated rectally. Serum biochemistry identified severe hypochloraemia, consistent with proximal intestinal obstruction and a poor prognosis. Although supportive and symptomatic treatment was provided, the bull died before a definitive diagnosis could be made. Postmortem examination identified a segmental intestinal intussusception, within the proximal jejunum, which had resulted in intestinal obstruction. The primary cause of this intussusception was a retroflexed intestinal diverticulum, which formed the intussusceptum. [ABSTRACT FROM AUTHOR]