Stillbirth in Cows

Stillbirth in cows means a calf dies before or during birth and is delivered dead at term or near term. In practice, it is often grouped with calving losses that happen around delivery, especially when labor is prolonged, the calf is too large, the calf is malpositioned, or the placenta is not working normally.

Stillbirth is not a single disease. It is an outcome with many possible causes. Some cases are linked to dystocia, which is difficult birth. Others are tied to infection, twin pregnancy, congenital defects, poor placental function, heat stress, or metabolic and nutritional problems in the dam.

Even when the calf has died, the cow still needs attention. A hard delivery can leave her exhausted, injured, dehydrated, or at risk for retained fetal membranes and uterine infection. Your vet can help decide whether she needs monitoring only, on-farm treatment, or more advanced care.

One of the most common pathways to stillbirth is dystocia, or difficult calving. This can happen when the calf is too large for the cow or heifer, the pelvis is relatively small, the calf is in the wrong position, or assistance is delayed. First-calf heifers have a higher dystocia risk than mature cows, so they also carry a higher risk of calf loss around birth.

Stillbirth can also follow placental and fetal disease. Infectious causes of abortion and late-gestation fetal death in cattle include agents such as Leptospira, bovine viral diarrhea virus, Neospora caninum, fungal placentitis, and in some regions other reproductive pathogens. Some infections cause abortion earlier in pregnancy, while others can lead to weak calves, premature birth, or stillbirth near term.

Other contributors include twin pregnancy, congenital defects, poor body condition, overconditioning, mineral or energy imbalances, heat stress, and poor calving management. Retained fetal membranes are more likely after stillbirth, dystocia, abortion, twin birth, placentitis, and metabolic stress, so your vet may look at the whole calving picture rather than one isolated event.

Sometimes no single cause is confirmed. That is common in bovine reproductive loss workups. The best chance of finding an answer usually comes from combining herd history, breeding dates, vaccination records, feed and environment review, and laboratory testing of the fetus and placenta.

Diagnosis starts with the calving history. Your vet will want to know the due date, whether this was a heifer or mature cow, how long labor lasted, whether traction was used, whether the calf was presented normally, and whether there have been other recent abortions, weak calves, or stillbirths in the herd. A physical exam of the cow helps identify trauma, uterine tears, retained fetal membranes, metritis, milk fever, dehydration, or other postpartum problems.

If the cause is not obvious, your vet may recommend a diagnostic workup on the calf and placenta. In cattle, the fetus and placenta are among the most valuable samples for reproductive loss testing. They should be kept clean, bagged separately if possible, chilled but not frozen, and sent quickly to a diagnostic laboratory. Depending on the case, testing may include necropsy, histopathology, bacterial culture, PCR, serology, and examination of placental lesions.

Your vet may also suggest herd-level investigation if more than one case has occurred. That can include reviewing sire selection and calving-ease data, nutrition, body condition, mineral program, vaccination timing, biosecurity, and exposure to dogs, wildlife, standing water, or moldy feed. In some herds, the goal is not only to explain one stillbirth but also to reduce the risk of the next one.

Prevention starts long before calving. Good heifer development, body condition management, and sire selection for calving ease can lower dystocia risk. This matters especially in first-calf heifers, where difficult birth is more common. Close observation during the calving window and timely assistance also make a real difference, because delays can cost both calf and cow.

Work with your vet on a herd reproductive health plan. That may include vaccination strategy, biosecurity for new arrivals, control of venereal disease, feed and mineral review, and investigation of any pattern of abortions, weak calves, or stillbirths. If an abortion or stillbirth occurs, rapid sample submission improves the odds of identifying an infectious or placental cause.

Daily management matters too. Keep calving areas clean, dry, and low stress. Avoid overcrowding and major social disruptions around calving when possible. Maintain consistent nutrition in late gestation, and watch for cows with twins, poor body condition, or previous calving difficulty, because they may need closer monitoring.

Not every stillbirth can be prevented. But a practical plan with your vet can reduce risk, improve response time, and protect both the cow and the rest of the herd.