Milk Fever in Beef Cows

Milk fever is a calcium-related problem around calving, and it is less common in beef cows than dairy cows. It still happens, and a down cow near calving is always a reason to call the vet.

Key points

Milk fever is low blood calcium near calving and is not a true fever.
Older cows and over-conditioned cows are at greater risk.
A down cow around calving needs a veterinarian right away.
Dry cow nutrition planning with a nutritionist helps prevent it.
Keep records and follow withdrawal times on any treated animal.

What milk fever means

Milk fever is the common name for low blood calcium near calving, and the medical term is hypocalcemia. Despite the name, the cow usually does not have a fever. Her body is suddenly asked to produce milk and calcium demand jumps faster than her body can mobilize it.

Dairy cows get it far more often because of heavy milk production, but beef cows can be affected, especially older cows or cows in high-stress situations.

Who is more likely to get it

Older cows are generally at higher risk than young ones. Cows that are very fat, those with a hard calving, and those under stress from weather, transport or handling around calving also deserve attention. Certain feeding situations before calving can raise the risk too, which is where a nutritionist earns their fee.

A cow that has had it before is more likely to have it again, so keep records of every case.

Signs by stage

The picture changes as the problem gets worse. Early on, a cow may seem restless, wobbly or reluctant to move. Later she may lie down and be unable to rise, with a cool body and a dull look. If left alone, she can lose consciousness and die.

Remember that a cow down around calving can have many causes, from nerve damage to infection to other metabolic problems. Only a veterinarian can tell them apart.

Nervousness, shaking or an unsteady gait
Reluctance to walk, stiffness in the hind end
Lying down and unable to stand
Cool ears and legs, dull eyes
Head turned back toward the flank

What to do when you see it

Call your veterinarian immediately. Treatment needs to be given correctly because mistakes can harm the cow, so this is not something to attempt without direction. While you wait, keep the cow upright on her chest if she is down, with her sternum supported, and shade or shelter her from weather. Do not drench a down cow, since she may inhale it.

Move other cattle away so nobody tramples her, and have a clear path for the vet's vehicle.

Plan ahead for the calving area as well. A clean, quiet pen or a well-drained pasture with shelter makes it easier to watch cows closely, spot one that is off and get a vet to her quickly if you need to. Keep a working phone number for the clinic where everyone on the place can find it, including after-hours instructions.

Preventing it with feeding and management

Prevention begins weeks before calving with the dry cow ration. A nutritionist can review your forage test, the mineral program and the balance of the diet, and suggest changes if your herd has a pattern. Do not change a dry cow diet on your own using rules of thumb found online. Ask for the targets that fit your forage and cows.

Body condition also plays a part. Cows that come into calving too fat are more prone to metabolic troubles. Review condition scores at late pregnancy with your vet or extension specialist.

After recovery

Cows that recover can still have trouble. Ask your vet to check for related problems such as retained placenta, uterine trouble or poor milk letdown, and watch the calf closely, since a weak cow may not feed it well. Make sure the calf gets colostrum.

Any milk or meat withdrawal times that apply to treatments must be followed exactly. Flag the cow in your records and talk with your vet about whether to keep her in the herd.

Keep an eye on mineral intake all the way through the dry period, not only the last few days. Ask your nutritionist how often to retest forage and whether a change in hay source means a change in the plan. A new cutting can shift the mineral picture even when it looks identical in the bale.

Common mistakes

The usual errors are waiting to see if she gets up on her own, trying a home remedy, feeding without a forage test, and not recording which cows were affected. Quick action and good records put you ahead next calving season.

When to get help: Call your veterinarian immediately for any cow that is down or wobbly near calving, and ask your nutritionist to review the dry cow ration and mineral program. Withdrawal times on labels or set by your vet must be followed so residues stay out of the beef supply.

Sources and further reading

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

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