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Breeding, Genetics & ReproductionCystic Ovaries in Cattle
Ovarian cysts can interrupt normal cycling and leave a cow open, though they are more often discussed in dairy than in beef herds. Diagnosis and treatment belong to your veterinarian.
Key points
- Ovarian cysts can interrupt normal cycling and leave cows open.
- Signs overlap with anestrus and other problems, so an exam is needed.
- Treatment is a veterinary decision and withdrawal rules apply.
- Good nutrition and herd health lower the risk.
- Cull cows with repeated fertility problems.
What a cyst is
An ovarian cyst is a fluid-filled structure on the ovary that does not release an egg the way a normal follicle should. It can disrupt the hormone signals that keep a cow cycling, so affected cows may stop showing heat or show heat at odd times.
Cysts are reported in cattle of all kinds. They tend to be associated with high-producing dairy cows, but beef cows are not immune, especially around the time after calving.
Cysts are only one of several reasons a cow may stop cycling, which is why an exam matters more than a guess. Treating a cow for the wrong problem wastes money and time.
Signs you might notice
Signs vary. Some cows stop cycling and look like anestrus cows. Others show frequent or constant heat signs. Some show no outward sign and are only found at a pregnancy check or when they stay open.
Because the signs overlap with other fertility problems, you cannot diagnose a cyst by watching alone. Many cows with similar signs have other causes, such as poor condition or a bull problem.
Keep notes on heat behavior. A cow seen mounting others constantly or one never seen in heat across a full season gives your vet useful clues.
- No heat seen after calving
- Irregular or frequent heat signs
- Cow stays open after repeated breedings
- Changes in behavior, such as mounting others
How a veterinarian finds out
A veterinarian can examine the ovaries by palpation or ultrasound and judge whether a cyst is present, and can often tell it from a normal structure. Sometimes repeat exams are needed because normal structures can look similar at a single point in time.
Records help your vet. Bring calving dates, breeding dates, heat observations and past treatments for the cow.
Ask your vet whether an exam makes sense for a single cow or whether it is better folded into your regular pregnancy check day, when cows are already in the chute.
Treatment is a veterinary decision
Treatment, if used, involves hormone products chosen and directed by the veterinarian. This article does not cover products or protocols and you should not use leftover drugs or advice from elsewhere. Some cysts resolve on their own.
Any treated animal must meet label or veterinary withdrawal times before sale for slaughter or before any milk is used, and residue avoidance protects the beef supply. Keep written treatment records for every cow.
Risk factors and prevention
Risk factors discussed by researchers include the period soon after calving, stress, energy imbalance and certain diseases around calving. The causes are not simple. Good nutrition, steady body condition, a clean calving area and a herd health plan reduce problems of all kinds.
Watch cows in the first weeks after calving. Early attention to retained placentas, infections and thin cows helps protect later fertility.
Postpartum health problems and a rough calving can set up trouble later. Treat the cow well from the first day after calving.
- Feed cows to calve in good condition
- Keep calving areas clean
- Watch for retained placentas and infections
- Review herd health with your vet
Culling and genetics
A cow that has recurring fertility trouble despite good care is a cull candidate. Because susceptibility may have some genetic component, do not keep daughters of cows with repeated problems without careful thought.
Record the reason for each cull and review the list yearly with your veterinarian.
Think about the herd as well as the cow. If several cows have the same problem, nutrition, stress or an infection may be the common thread.
Common mistakes and what to ask
Mistakes include assuming every open cow has a cyst, treating without an exam and ignoring herd-level causes such as nutrition or bull fertility.
Ask your vet: Is this cow cycling? Is there a cyst or another cause? What is the plan and what is the cost compared with the value of a calf? Ask whether herd-level issues could be involved.
Ask your vet how long to wait before deciding a cow is not going to breed, and put that date in your calendar so the decision does not drift.
Sources and further reading
- American Association of Bovine Practitioners
- University of Nebraska-Lincoln Beef
- Oklahoma State University Extension
- U.S. Food and Drug Administration
Organization homepages are linked so you can search them for current guidance on this topic.