Enterotoxemia in Lambs: Causes, Signs and How to Prevent It

Enterotoxemia, often called pulpy kidney or overeating disease, is a sudden and usually fatal condition caused by Clostridium perfringens bacteria multiplying in the gut and releasing toxins. It typically kills the biggest, fastest-growing lambs and kids after a sudden change to rich feed. Most animals are found dead. Prevention rests on clostridial vaccination following your vet's schedule and on gradual, consistent feeding.

Many breeders discover enterotoxemia the hard way: the best lamb in the pen, eating well the night before, is found dead in the morning. Understanding why it happens makes it one of the most preventable causes of loss in a sheep or goat farm.

What causes enterotoxemia

Clostridium perfringens lives normally in the soil and in the gut of healthy animals in small numbers. Trouble starts when the gut suddenly receives a large amount of starch, sugar or protein that is not fully digested in the rumen. Undigested feed reaches the intestine, the bacteria multiply very fast and produce toxins that are absorbed into the blood and damage the brain, kidneys and other organs.

Two forms are commonly described:

• Type D (pulpy kidney): the classic form in growing and fattening lambs and kids, usually from a few weeks of age onwards, linked to rich feed.
• Type C: affects very young lambs and kids in their first days or weeks, often linked to large milk feeds, and causes bloody diarrhoea and sudden death.

Typical triggers include:

• A sudden increase in grain or concentrate, for example the first days in a fattening pen.
• Moving lambs onto lush green pasture or irrigated fodder.
• Irregular feeding: missed meals followed by animals gorging.
• Lambs nursing heavy-milking ewes, or orphan lambs given large irregular milk feeds.
• Stress and changes at weaning or after transport.

Signs: often too late

The disease moves so fast that most cases are found dead. When signs are seen, they can include:

1. Sudden dullness, the lamb stops eating and stands apart.
2. Nervous signs: staggering, head pressed back, convulsions, paddling on the side.
3. Abdominal pain, kicking at the belly; sometimes diarrhoea.
4. Death within hours.

In goats, enterotoxemia may also appear in a longer form with repeated diarrhoea and weight loss. Because sudden death has many possible causes, ask your vet to examine dead animals. A post-mortem and laboratory tests are the only way to confirm the cause and avoid treating the wrong problem.

Prevention part 1: clostridial vaccination

Clostridial vaccines are among the most common and cost-effective vaccines in sheep and goat farming. In general, the approach is:

• Pregnant ewes and does receive a booster before birth, so protection passes to the newborn through colostrum.
• Lambs and kids start their own vaccination course when the protection from colostrum begins to fade, followed by a booster.
• Adults are boosted regularly.

The exact timing, the product (many vaccines cover several clostridial diseases at once) and how often to boost must follow your local vet and ministry schedule. Goats often need more frequent boosters than sheep, so ask your vet specifically about your goats. You can see where clostridial vaccines fit in the year in our sheep and goat vaccination schedule.

A vaccine only works if it is stored in the fridge, given to healthy animals and completed with its booster. A first dose alone gives weak, short protection.

Prevention part 2: feeding management

Vaccination reduces the risk; feeding management removes most of the trigger. Simple rules that make a big difference:

• Change feed slowly. Raise concentrate in small steps over about 2 to 3 weeks. Never jump straight to a full fattening ration.
• Keep roughage available. Hay or straw keeps the rumen working and slows the passage of starch.
• Feed at fixed times and give enough trough space so dominant lambs do not eat the share of others.
• Avoid empty-then-full cycles. If a meal is missed, do not double the next one.
• Watch the best growers. The biggest, greediest lambs are the most at risk.
• Introduce lush pasture gradually, with dry feed first.

These rules overlap with good fattening practice in general. A steady ration also improves feed conversion, as explained in our feed conversion ratio guide.

What to do when a lamb dies suddenly

1. Call the vet and ask whether a post-mortem is possible. Do not assume enterotoxemia without confirmation.
2. Check the vaccination status of the dead animal, its group and its mother.
3. Review the ration: was there a recent change, a new feed batch, a missed meal?
4. Protect the rest of the group: the vet may recommend vaccination or ration changes for the pen. Treatment of sick animals is a vet decision; most affected animals die too fast to respond.
5. Dispose of the carcass safely following local rules, to avoid spreading bacteria to the soil around the pens.

Keeping the records that prevent repeat losses

Enterotoxemia often repeats in the same farm because the same mistakes repeat: forgotten boosters, unvaccinated new animals, sudden ration changes at the start of each fattening batch.

In Throf you can record clostridial vaccinations per animal or per group and get a reminder before the booster is due, so lambs do not miss their second dose. Births link each lamb to its mother, so you can check whether the dam was vaccinated before lambing. Meals and feed stock are recorded per group, which makes it easy to see when a ration changed, and each death can be recorded with its cause so patterns appear over time.

The short version

Enterotoxemia strikes the best lambs after sudden rich feeding. Vaccinate dams and young stock on your vet's schedule, complete every booster, change rations slowly and keep roughage available. When a lamb dies suddenly, get the cause confirmed and fix the trigger before it happens again.