Intestinal Volvulus and Torsion in Sheep

Intestinal volvulus and torsion mean part of the intestine twists abnormally. In a volvulus, the bowel twists around its mesenteric attachment. In a torsion, the bowel rotates along its own long axis. Either way, feed and fluid can no longer move normally, and blood flow to the affected intestine may be reduced or completely cut off.

This is a true emergency in sheep. When the bowel becomes trapped and its blood supply is compromised, the intestine can quickly become damaged, leak bacteria and toxins, and trigger shock. Merck Veterinary Manual describes these as mechanical intestinal obstructions that often need surgery rather than medical care alone.

Sheep are not the most common species affected, but intestinal volvulus is recognized in lambs. Because sheep often hide illness until they are very sick, a lamb or ewe with a twisted intestine may look only mildly uncomfortable at first and then worsen fast. Early veterinary assessment gives the best chance of finding a treatable case before irreversible bowel injury develops.

A twisted intestine usually develops when normal intestinal movement is disrupted and a loop of bowel rotates into an abnormal position. Merck lists altered intestinal motility, rapidly fermentable feed, dietary disorders, enteritis, parasitism, adhesions, herniation, and other causes of obstruction as important contributors in large animals. In practical terms, anything that changes gut fill, gas production, or bowel movement patterns may raise risk.

In sheep, reported risk is highest in lambs, although adults can also develop severe intestinal obstruction. Sudden feed changes, heavy grain intake, low effective fiber, dehydration, and concurrent intestinal disease may all contribute by changing motility and gas production. Some cases are linked to other mechanical problems such as fibrous bands, hernias, or masses, while others happen without a clear trigger.

Pregnancy, recent abdominal inflammation, and previous surgery may also matter in some animals because they can change abdominal space or create adhesions. Even so, many flock-level cases are not predictable ahead of time. That is why prevention focuses more on steady feeding and good flock management than on any single guaranteed step.

Your vet will start with the history and a physical exam, looking for pain, abdominal distention, dehydration, shock, and reduced manure output. Merck states that diagnosis of intestinal obstruction in large animals is based on examination findings together with transabdominal ultrasonography, clinicopathologic testing, peritoneal fluid analysis, rectal palpation when feasible, and sometimes exploratory laparotomy.

In sheep, diagnosis can be challenging because their size limits what can be felt internally, and early signs may overlap with bloat, enteritis, intussusception, abomasal disease, urinary obstruction, or severe parasitism. Ultrasound can help identify distended loops of intestine, reduced motility, or excess abdominal fluid. Bloodwork may show dehydration, electrolyte changes, acid-base problems, or evidence of shock.

If your vet strongly suspects a strangulating obstruction, surgery may be recommended both to confirm the diagnosis and to treat it. In some fatal flock cases, the final diagnosis is made on necropsy, which can still be very valuable because it helps guide prevention and breeding or management decisions for the rest of the group.

Not every case can be prevented. Merck specifically notes that prevention of all intestinal obstructions is not possible. Still, flock management can reduce risk. The most practical steps are to avoid abrupt feed changes, maintain steady access to clean water, limit sudden heavy grain intake, and provide enough effective fiber so rumen and intestinal motility stay more stable.

Good parasite control and prompt treatment of enteritis also matter, because intestinal irritation and abnormal motility can set the stage for obstruction. Work with your vet on a flock-specific parasite plan rather than deworming on a fixed habit alone. In growing lambs, make ration changes gradually over several days and watch closely after any diet transition.

It also helps to reduce access to foreign material, spoiled feed, and coarse indigestible roughage. If a sheep dies suddenly after showing abdominal pain or low manure output, ask your vet about necropsy. A postmortem exam may confirm volvulus, rule out contagious disease, and help protect the rest of the flock with more targeted management changes.