Ketosis in Dairy Cows: Prevention and Treatment Basics

Ketosis happens when a fresh cow cannot take in enough energy to keep up with milk production. It is common, it is costly, and much of it can be prevented.

Key points

Ketosis follows a fast loss of body fat after calving.
Subclinical cases cut milk and raise the risk of other diseases.
Screen fresh cows on a schedule your vet recommends.
Condition at calving, ration and feed intake are the main prevention levers.
Treatment is a vet-led decision, and withdrawal times must be followed.

What ketosis is

After calving, a cow's milk output climbs faster than her appetite. To fill the gap she breaks down body fat. When that happens too fast, byproducts called ketones build up in the blood, milk and urine and make her feel off feed.

There are two ways to think about it. Clinical ketosis shows signs. Subclinical ketosis does not, but it still cuts milk, makes other diseases more likely and can affect breeding.

Signs to watch

A cow with ketosis may eat less grain, lose weight fast and give less milk than expected. Some cows are dull and quiet. A few act oddly, such as walking in circles, licking things or seeming nervous.

Your nose may help: some cows have a sweet smell on the breath or in the milk. Do not rely on smell alone, since not every case can be noticed that way.

Reduced appetite, especially for grain
Falling milk yield
Fast weight loss
Dull attitude
Unusual nervous behavior in some cows
Sweet or acetone smell on the breath

Who is most at risk

Cows that calve overly fat are at the highest risk, because they mobilize more body fat and tend to eat less around calving. Cows with other fresh problems, such as retained placenta, displaced abomasum, milk fever or metritis, are also more likely to develop ketosis.

Heat stress, crowding, sudden ration changes and poor bunk management during the close-up period and early lactation add to the risk.

Monitoring fresh cows

Many herds screen fresh cows for ketones during the first couple of weeks of lactation using cow-side tests of blood, milk or urine. Ask your vet which test fits your herd, how often to run it and what result calls for action.

Keep a list of cows tested and the results. Over time you will learn whether your herd's rate is steady, rising or falling, which tells you whether your prevention program is working.

Prevention that works

Prevention begins before calving. Aim for cows at a moderate body condition score on the one-to-five scale, and avoid letting dry cows put on too much condition late in the dry period. Work with your nutritionist on a close-up ration that prepares the rumen for the lactation diet.

Keep feed intake high with fresh feed, clean bunks, enough space at the bunk, comfortable stalls and cool conditions. Treat other fresh diseases quickly so they do not pull appetite down.

Moderate condition at calving
Consistent close-up and fresh rations
Plenty of bunk space and fresh feed
Cooling in hot weather
Quick attention to other fresh problems
Calm, low-stress calving area

Treatment basics and working with your vet

Treatment of ketosis is a vet decision. Your veterinarian can set a written protocol that fits your herd, covering which cows to treat, what to give, how to follow up and how long to follow the withdrawal time. This article does not cover products or doses.

Repeat cases and cows that do not respond need a closer look, because another disease may be hiding underneath, such as a displaced abomasum or an infection.

What to ask, records and common mistakes

At your next herd visit, ask for a plain-language fresh cow plan. Bring your records for the last several months so you can compare rates of ketosis, displaced abomasum and retained placenta across groups of cows.

Write down each cow's calving date, body condition, test results, any other fresh disease, and her milk in the first weeks. Review the list monthly. If rates rise after a ration change, a heat spell or a new group layout, you have found a good clue to follow up with your advisers.

Waiting for obvious signs, ignoring a rise in herd ketosis rates, and giving treatments without a vet protocol are common mistakes. Always keep milk and meat from treated cows out of the food supply for the label or vet-directed withdrawal time.

Which test do you recommend for screening, and how often?
What result should lead to a recheck or a call?
Is our dry period body condition on target?
Are heifers and older cows doing equally well?
What does a fresh cow with other problems need that a healthy cow does not?

When to get help: Ask your veterinarian to write a fresh cow monitoring and treatment protocol for ketosis. Ask your nutritionist to review the dry and close-up rations if your herd sees repeated cases.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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