11 Pregnancy Diseases in Livestock: Common Risks, Symptoms and Prevention Tips

Pregnancy is a very delicate stage in the lives of farm animals, similar to the same period in humans. Ensuring that pregnant animals successfully carry to term and deliver safely is a core function of a thriving and profitable livestock farm. 

This is why farmers need to guard against pregnancy-related health issues, which can not only jeopardise the life of the animal and its offspring but also result in significant economic losses through reduced fertility, veterinary expenses, and loss of production.

There are several pregnancy-related health issues that farmers need to watch out for in gestating livestock. Primarily, they can be split into three: Metabolic Disorders, Infectious Reproductive Diseases, and Post-Partum Problems.

The causes of these issues vary, ranging from a simple lack of required nutrients in feeds to bacterial infection contracted from a contaminated environment and infected animals. And the effects can be devastating enough to cost the life of both the animal and offspring or the fertility of the whole herd. However, when spotted and treated early, most of these diseases can be easily managed to prevent a disastrous outcome.

This guide details critical information about diseases affecting livestock during and immediately after pregnancy, helping farmers to identify the symptoms, cause and management tactics to get things back on track.

Metabolic Disorders in Pregnancy

Metabolic disorders in pregnant animals are primarily driven by the immense energy and mineral demands of the developing fetus(es). In simple terms, a pregnant animal needs extra energy to grow her babies. This issue goes beyond just more food, but food with the required nutritional values. If she doesn’t get the right "fuel", she gets sick, affecting both her and the baby. Some of the common issues of this nature include:

1. Pregnancy Toxaemia (Ketosis/Twin Lamb Disease)

The target of this is primarily small ruminants, such as sheep and goats, and it is caused by inadequate energy intake relative to the high metabolic demand of carrying multiple offspring in the womb. The body mobilises fat too quickly, leading to an overload of ketones, which is a deficient nutrition for both the animal and the babies.

Symptoms of this disease include: dullness, separation from the herd, loss of appetite, neurological signs (stargazing, pressing head against objects), and eventual inability to stand and coma.

Management of this disease will require the provision of high-energy supplementation (e.g., grain) in the final 4–6 weeks of pregnancy. Farmers can also use high-energy syrup (like molasses or special vet liquids),  propylene glycol for early-stage cases. In severe cases, emergency C-section or induced delivery may be required.

2. Fatty Liver Disease

This disease often targets dairy cows (typically fat/obese ones), and it is caused by a severe negative energy balance following calving, where the liver is overwhelmed by fatty tissue.

The symptoms include: reduced milk yield, weight loss, dullness, and suppressed immune function.

To manage fatty liver disease, farmers should practice Body Condition Score (BCS) management, which means weight watching. Also, providing high-quality forage and minimising stressors during the transition period is critical to the cow’s recovery.

3. Hypocalcemia (Milk Fever)

Hypocalcemia or low calcium is caused by a sudden, massive demand for calcium for milk production in cows; it often affects high-producing dairy cows and occasionally older ewes. 

Symptoms of hypocalcemia include muscle tremors, staggering, cold extremities, and "downer" cow (unable to rise).

Administering intravenous calcium gluconate will help manage the situation, while prevention involves a low-calcium diet in the dry period or the use of anionic salts to prime the cow’s calcium mobilisation system.

Infectious Reproductive Diseases

These diseases are caused by germs that can spread through a herd. They are often responsible for "abortion storms," where many animals lose their pregnancies at the same time.

1. Brucellosis (Bang’s Disease)

Brucellosis is caused by Brucella bacteria, a bacterium that targets the fetus in the womb of animals like cows, sheep, goats, pigs, and even dogs.

These infectious diseases usually cause the mother to lose her baby late in pregnancy. She may also have a retained placenta (where the "afterbirth" doesn't come out) and may have trouble getting pregnant again, causing permanent infertility in the animal.

Using vaccines and adhering to best biosecurity practices on the farm to prevent its occurrence is the best protection against brucellosis because it can’t be cured. In the unfortunate instance of it affecting a farm, managing it requires strict control and making hard decisions. An affected farmer would start by first keeping infected animals away from the healthy ones (quarantine), then follow the testing and culling (removing) protocol to salvage the uninfected animals from being infected.

2. Leptospirosis

Leptospirosis is caused by Leptospira bacteria, which often live in water or mud contaminated by the urine of rats or other wildlife. The main sign of infected animals is the loss of the baby (abortion) or calves being born dead. You might also see jaundice, which is a yellow colouring of the eyes and skin.

Farmers must vaccinate their herd regularly and keep cattle away from dirty ponds or slow-moving water where rats live. Keeping the feed storage clean is also important to discourage rodents from getting there.

3. Campylobacteriosis (Vibriosis)

This is a breeding disease caused by bacteria passed from the bull to the cow during mating. It manifests through early embryonic death, meaning the cow conceives but loses the baby so early that you don't even know she was pregnant. The cows often return to heat repeatedly, giving the illusion of infertility.

Since bulls typically carrying this infection do not present with symptoms, regular testing before breeding season is important. Vaccinating the bulls is also an effective way to stop the spread.

4. Neosporosis

Neosporosis is an infection caused by a parasite called Neospora caninum. This is a major cause of abortion in cattle, typically happening between 4 and 7 months of pregnancy. While some fetuses survive the infection, the calves that do survive may have brain or nerve issues.

The disease can reduce milk yield, conception rates, and overall herd productivity, leading to significant economic losses estimated in billions of dollars globally. 

Neosporosis is often passed from the mother to the baby in the womb or through ingestion of oocysts shed by infected dogs or wild canids contaminating feed, water, or the environment. Dogs

Dogs are a big part of the cycle of this disease; keeping them away from the feed and water troughs is recommended. If a cow is a known "carrier" of this disease, she should be removed from the breeding herd.

5. Toxoplasmosis

A tiny parasite called Toxoplasma gondii causes Toxoplasmosis disease. It is most often linked to cats that have the parasite in their faeces and causes stillbirths or "mummified" babies (babies that dry up inside the womb) in small ruminant animals. 

This disease is also zoonotic (can be transferred to humans), posing a potentially serious problem to pregnant women and immunocompromised people.

The transmission of toxoplasmosis is all about hygiene, so keeping cats out of hay and grain storage is critical to its prevention because if the animals eat food contaminated by cat droppings, they become infected.

6. Q Fever

Q fever, also known as coxiellosis, is caused by a stubborn bacterium called Coxiella burnetii. The disease commonly affects domestic ruminants such as cattle, sheep, and goats.  It causes reproductive issues such as abortions, stillbirths, or weak offspring, particularly in previously uninfected herds or flocks. Like Brucellosis, this is also very dangerous to humans.

This disease often spreads through inhalation of contaminated aerosols, contact with infected placenta, fetal fluids, urine, or faeces, and occasionally via ticks.

Vaccination of susceptible animals, where available, is a highly recommended preventative practice. Management of this disease in a farm requires keeping the calving area clean. If an animal loses a baby, isolate her immediately to stop the spread to others, use gloves/protection when cleaning the area and dispose of both the dead offspring and placenta properly.

Post-Partum and Structural Conditions

The immediate period after birth is high-risk for secondary infections and mechanical complications.

1. Metritis

Bacterial contamination of the uterus often follows a difficult birth or an unsanitary environment. While metritis can affect various species, it is most commonly observed in cattle, particularly dairy cows.

The symptoms of metritis include foul-smelling, watery, reddish-brown vaginal discharge, fever, and a drop in milk yield.

While systemic antibiotics and anti-inflammatory drugs are often used to cure this disease, maintaining clean, dry calving pens to reduce bacterial challenge is a good way to prevent recurrence.

2. Retained Placenta (RFM)

Retained Placenta (RFM) is a condition in which the placenta is not expelled within the normal timeframe after delivery of an animal. It is a common complication in farm animals, particularly in dairy cows, and can lead to various health issues and reproductive problems.

This issue is often caused by nutritional deficiencies (specifically Selenium and Vitamin E), dystocia, or induction of labour.

A common symptom of RFM is failure of the fetal membranes to pass within 12–24 hours post-calving.

Management of this issue in a farm will involve monitoring for infection. Farmers should also make sure not to manually "pull" the placenta, as this can damage the uterus. Administering oxytocin if detected early and ensuring proper trace mineral supplementation can also help.

How to Keep Your Animals Safe

Injections (Vaccines): Just like kids get shots to stay healthy, animals need shots to stop germs like Brucellosis and Lepto.

Good Food: The last month of pregnancy is the most important. Give them the best hay and extra grain.

Cleanliness: Keep the area where they give birth clean and dry. Keep cats away from the animal feed.

Watch them closely: If an animal isn't eating or looks "off" right before she is due, call for help immediately.

Ultimately, the health of pregnant livestock is not a matter of chance but of consistent, informed management. From meeting heightened nutritional needs to preventing infectious diseases and maintaining hygiene before and after birth, the risks outlined here all point to one clear reality: small lapses can lead to major losses, while early action can save both animals and income. Farmers who prioritise balanced feeding, routine vaccination, strict biosecurity, and close observation of their animals—especially during late pregnancy and the post-partum period—are better positioned to protect their herds and sustain productivity. The path forward is practical and proactive: treat every stage of pregnancy as critical, enforce farm hygiene as a daily discipline, and respond quickly to warning signs. In doing so, farmers not only safeguard animal welfare but also strengthen the long-term resilience and profitability of their operations.