White Muscle Disease in Cattle: Recognition & Herd Care

White Muscle Disease (WMD), also known as Nutritional Muscular Dystrophy or Nutritional Myopathy, is a muscle-wasting condition in cattle that leaves the skeletal and heart muscle weak, stiff, and pale. Cut into affected tissue and you’ll see chalky white streaks running through the muscle fibers, which is exactly where the name comes from. I’ve seen it hit hardest in the hind legs and the heart muscle itself. A calf that looked fine grazing beside its mother in the morning can be flat on its side by evening. That’s how fast this one moves once it takes hold.

At the root of it, you’re almost always looking at a selenium deficiency paired with low vitamin E intake. Both work together to protect muscle cells from oxidative damage, and selenium is the bigger piece of that puzzle in most herds I’ve dealt with. Cut either one out of the diet for long enough and muscle fibers start breaking down from the inside. This isn’t rare or freak-accident stuff, either. It’s a known regional problem, since certain soil belts run naturally low in selenium, and anything grown on that ground carries the shortfall straight into your feed bunk no matter how green the pasture looks.

Young calves take the worst of it, especially ones born to cows that ran short on selenium and vitamin E through late pregnancy. The deficiency passes from dam to calf before birth even happens, so by the time the calf hits the ground, it’s already behind. The same deficiency shows up in small ruminants too — if you run goats or sheep alongside cattle, it’s worth reading up on White Muscle Disease in sheep and goats, because the mineral program that protects one species usually needs to cover the other.

Adult cattle aren’t immune, though it’s less common. Give an adult animal a long enough stretch on selenium-poor forage and you’ll eventually see the same stiffness and muscle weakness show up, just usually milder than in a calf. One thing worth being clear on: WMD doesn’t pass between animals. No virus, no bacteria, nothing contagious about it. It’s purely a feed and mineral gap. But don’t let that make you relax about it — weak calves, stunted growth, and dead stock from heart failure add up to real money lost, and it happens on a herd-wide scale once the deficiency sets in across your pasture.

Here’s my honest take after years of dealing with this: prevention is cheap and treatment is expensive, both in vet bills and in dead calves. A proper mineral program with selenium and vitamin E built in, selenium-fortified feed, or a scheduled vet injection for pregnant cows costs you almost nothing compared to losing even one calf. If you’re building out a broader herd health routine, our Farm Animal Health Management Guide covers how to fold mineral supplementation into your regular herd checks, and it’s worth cross-referencing against other cattle health risks like Lumpy Skin Disease in cattle so you’re not managing one problem while ignoring another.

White Muscle Disease: Signs and Symptoms in Cattle/Calves

The first thing you’ll notice is a calf that just doesn’t move right. It takes short, careful steps and tires out after walking a few yards. Some calves tremble while standing, while drinking milk, or even while just lying still. Most end up spending the bulk of their day lying down instead of following the herd around. I’ve caught this early a few times just by watching which calf hangs back at feeding time instead of pushing in with the others.

As it progresses, the muscles across the shoulders, legs, and back start to swell and feel firm, almost hard, when you press on them. The calf gets wobbly on its feet and may go down after just a few steps. You’ll sometimes see the back arch upward, or the head droop low, because the supporting muscles simply can’t hold the posture anymore. Knuckling over at the fetlock is one sign that gets farmers calling the vet fast, and it almost always traces back to a selenium shortfall, the root cause behind most cases of this disease.

When the tongue or throat muscles are involved, the calf struggles to nurse and milk dribbles back out of its mouth instead of going down. Weak chest muscles mean fast, labored breathing even at rest, no exertion needed. In the worst cases the calf can’t get up at all. It stays down, tries, fails, and tries again. Appetite drops off fast, weight falls away within days, and you’ll sometimes hear teeth grinding, which is a pain response, not a quirk.

In some calves the damage hits the heart muscle instead of the skeletal muscle, and that version is far more dangerous because it gives you almost no warning. A calf can look completely normal one minute and collapse the next, right after walking to the trough or finishing a suckling bout. Watch for rapid breathing, a heartbeat that feels too fast or irregular under your hand on the chest, and jugular veins that look more swollen than usual along the neck.

Cold ears and cold legs are another giveaway. It means circulation is already failing. In the most severe cases you’ll see foam or blood at the nose or mouth, a sign the lungs are filling with fluid. Once it reaches that stage, most calves don’t make it past 2 to 3 days. That’s why I tell new calf owners not to wait and see with any of this. A fast call to the vet and a selenium injection on day one beats a necropsy on day three, every time.

Here’s a rough guide to how the signs stack up as the disease moves from mild to critical. It’s not exact for every calf, but it’s close to what you’ll actually see in the field.

Stage	What you’ll see	Urgency
Early / Mild	Stiffness, short steps, tires fast, prefers lying down	Get selenium/vitamin E on board within days
Moderate	Swollen, firm muscles; wobbling; knuckling at the fetlock; trouble nursing	Call the vet now, don’t wait for it to worsen
Severe (skeletal)	Can’t rise, grinding teeth, rapid weight loss, labored breathing	Emergency treatment, same day
Cardiac form	Sudden collapse, irregular fast heartbeat, cold extremities, foam/blood at nose	Often fatal within 2-3 days; immediate vet care is the only shot

If you’re dealing with a broader pattern of sick or thin calves and not just one animal, it’s worth stepping back and checking your whole herd’s mineral program rather than treating cases one at a time. Our farm animal health management guide walks through how to set up that kind of routine mineral and nutrition check across a herd, which is cheaper in the long run than chasing emergencies.

Causes of White Muscle Disease in Cattle/Calves

Selenium shortage and vitamin E shortage are the two root causes here. There’s really no third factor worth chasing. Both nutrients work as antioxidants inside the muscle cell, mopping up the free radicals that build up during normal activity. Take either one away for long enough and the muscle fiber membrane starts to break down from the inside. That’s the whole mechanism in plain terms.

Soil is where this usually starts, not the feed bag. Certain regions just don’t have selenium in the ground, no matter what you plant. Parts of the Pacific Northwest, the Great Lakes basin, and the eastern seaboard are known for selenium-poor soil, and if you farm in one of those belts, you’re fighting this problem whether you realize it or not. Grass and hay grown on that land can test green and healthy and still carry almost nothing in the way of selenium. I’ve seen hay samples from two farms twelve miles apart come back with wildly different selenium numbers, so don’t assume your neighbor’s mineral program tells you anything about your own ground.

Here’s the part a lot of guides skip over: a cow doesn’t need to be visibly sick to pass the problem on. A dam running low on selenium through late pregnancy simply can’t load enough into the placenta or the colostrum, even if she looks fine standing in the pasture. Her calf is born with weak muscle reserves from day one, and it shows within the first two to six weeks of life — sometimes within hours if the heart muscle is hit hard. First-calf heifers and cows carrying twins seem to produce the weakest calves in my experience, probably because the demand on their own reserves is higher to begin with.

Vitamin E deficiency rarely shows up alone. It usually rides alongside the selenium problem and makes it worse. Feed that’s been stored too long, especially hay or grain held through a hot, humid summer, loses vitamin E fast through oxidation. Silage that’s gone through excess heating loses it too. So even a herd standing on decent selenium soil can still end up with sick calves if the stored feed is old or was baled wet. Fast-growing beef breeds and dairy calves on a heavy milk-replacer diet burn through vitamin E quicker than a slow-growing animal on pasture, which is part of why outbreaks tend to cluster in bottle-fed or orphan calves.

A few other things push the risk higher even on decent ground. High sulfate levels in well water or feed can block selenium uptake. So can excess calcium, or feeding a lot of legume hay without balancing the mineral program around it. Molybdenum and iron overload do something similar by tying up selenium before the animal can use it. None of these are the primary cause on their own, but they tip a marginal herd over into a clinical outbreak. I always tell farmers calling me about a sudden cluster of weak calves to check their water source along with the feed, because sulfate water gets overlooked constantly.

Season matters more than most people think. Outbreaks spike in late winter and early spring, right when cows have been off green pasture for months and are living on stored hay that’s already lost a chunk of its vitamin E. The calves born into that window are the ones you need to watch hardest. If you’re already dealing with other nutrition-linked problems in the herd, it’s worth stepping back and reviewing the whole mineral and feed program rather than patching one issue at a time — our farm animal health management guide walks through how to set that up properly across a herd.

Vitamin A shortage isn’t a direct cause of White Muscle Disease, but it’s common in the same herds and it adds to the damage. Calves short on vitamin A look dull-coated, eat less, and grow slower than herdmates. Stack that on top of a selenium and vitamin E deficiency and you get calves that go downhill faster and recover slower, even with the same dose of treatment.

Treating White Muscle Disease in Cattle

Once you spot the signs, don’t wait around. Treating white muscle disease means getting selenium and vitamin E into that calf fast, either through injection or feed, and the sooner you act the better the odds. I’ve treated calves that bounced back in 48 hours and others that needed a full week of nursing. The difference almost always came down to how early we caught it.

The go-to treatment is a Bo-Se injection, though some vets stock Mu-Se instead. Both get selenium into the bloodstream quickly, usually within hours, and that’s what you need when a calf is already struggling to stand. Don’t try to guess the dose yourself — call your vet or check the label on the vial. As a rough guide, most protocols work out to around 1 milligram of selenium and 50 milligrams of vitamin E per 18 kilograms (about 40 pounds) of body weight. The shot goes either subcutaneously or intramuscularly, and if the calf needs a repeat dose, that’s usually given about two weeks later. I wouldn’t go past four total injections in a course — selenium builds up in the body, and selenium toxicity is a real risk, not just a warning label. Signs of overdose include staggering, blindness, and colic, so more is not better here.

After the injection, the calf needs rest, not exercise. Keep it in a dry, draft-free pen — cold, wet ground makes muscle recovery slower and raises the risk of pneumonia on top of everything else. If the calf can’t nurse properly because its tongue or jaw muscles are affected, don’t just leave it — tube feed or bottle feed warm milk several times a day. A calf that goes 12 hours without milk when it’s already weak can go downhill fast.

Mineral supplementation matters here too. Once the acute treatment is done, mix in a selenium and vitamin E fortified mineral so the muscle tissue has what it needs to rebuild. Skip the fatty or oily feeds during recovery — fat interferes with vitamin E absorption, which works against everything you’re trying to fix. Stick to clean, fresh forage and a proper farm health management routine rather than improvising.

Some calves don’t just have muscle damage — the heart and lungs take a hit too. If a calf is still breathing hard or looking weak after the selenium shot, that’s your cue to get the vet back out. They may add IV fluids, glucose, or antibiotics to cover secondary infection, since a weakened calf is an easy target for pneumonia and scours on top of the original problem.

When vitamin E deficiency is driving most of the damage rather than selenium, oral vitamin E supplements or vitamin-rich feed make a real difference, and you’ll usually see it within days. Start with a higher loading dose, then taper down to a maintenance level once the calf is back on its feet. Again, avoid high-fat feeds during this window — they work against the vitamin E you’re trying to get into the animal.

Most calves that get treated early start perking up within a day or two — eating better, standing steadier, moving around more. Calves with serious heart or muscle damage take longer, sometimes two to three weeks, and a few never fully recover their stamina. Keep a close eye on any calf that’s had white muscle disease once; they’re more prone to relapse if the underlying mineral deficiency in your soil or feed isn’t fixed. Treatment costs for injections and vet call-outs add up fast when you’ve got several calves down at once, which is worth factoring into your herd cost planning if selenium deficiency is common in your area.

Prevention of White Muscle Disease in Cattle

You can beat this disease without spending much money. Selenium and vitamin E in the right amounts, fed consistently, stop White Muscle Disease before it ever starts. I’ve seen herds go years without a single case once the mineral program got sorted out properly. That’s the real goal here, not treating sick calves every spring.

Balanced Feeding

Give your cattle a daily mix of fresh green fodder and decent roughage. Lucerne, berseem, and clover carry good vitamin E, so work them into the ration whenever you’ve got them growing. No fresh fodder on hand? Clean hay or silage will do the job, as long as it’s stored right. Skip the old, moldy, or sun-bleached stuff. It loses most of its vitamin content fast, and feeding it long-term is basically how you end up with weak, slow-growing calves without realizing why.

Selenium-Rich Feed Sources

Barley, oats, corn, and soybean meal can supply selenium, but only if they were grown on selenium-adequate soil. That’s the catch most new farmers miss. A bag of corn from one county can carry a fraction of the selenium that the same crop grown two states over has. Soil maps vary that much. So don’t assume your grain ration has you covered just because it looks balanced on paper. Get your feed tested, or just build in a mineral mix with selenium and vitamin E as a standing part of the diet. It’s cheap insurance against a disease that kills calves in days once it takes hold.

Supplements for Prevention

In low-selenium regions, supplementation isn’t optional. I’d treat it as a core part of herd health management, the same way you’d treat vaccination or deworming. Your main options:

• Bo-Se, E-Se, or Selecron injections given by a vet, usually timed around calving and again at a few weeks old.
• Selenium-vitamin E boluses, which sit in the rumen and release minerals slowly over weeks or months.
• Fortified feed premixes or mineral blocks that cattle can access free-choice year-round.

Pregnant cows should get a selenium and vitamin E boost about a month before calving. This one step does more to prevent White Muscle Disease than almost anything else on this list, because it builds the calf’s muscle reserves before birth and loads the colostrum with the nutrients the newborn needs in its first hours. If you’re only going to do one thing from this whole prevention section, do this.

Regular Nutritional Checks

Get a vet or livestock nutritionist to review your feed and mineral program every so often, not just when something’s already gone wrong. Soil selenium levels don’t change overnight, but your feed sources might, especially if you buy hay from different suppliers through the year. A quick blood test on a few calves can tell you where your herd actually stands instead of guessing. This pairs well with a broader farm animal health management routine, where mineral checks sit alongside vaccination schedules and parasite control instead of being an afterthought.

Good Management Practices

Calves need a clean, warm, dry place to stay, and that matters even more once the weather turns cold or wet. Damp bedding and drafts stress a calf’s system right when it’s already working hard to grow. Keep feeding times regular and water fresh, since stressed calves eat less and recover slower from everything, not just WMD. Every newborn needs colostrum within the first few hours of life, full stop. That early feeding carries the selenium and antibodies that set up a strong immune system and healthy muscle development down the line. Skip it, and you’re starting the calf off already behind.

If you’re weighing whether a selenium program is worth the cost against the rest of your herd budget, it helps to run the numbers against your overall herd value. A tool like the cattle cost calculator makes that comparison easier, and once you see what one dead calf actually costs you, a $3 mineral block stops feeling like an expense and starts looking like the cheapest line item on the whole farm. Good mineral management is also just part of running a profitable operation generally; it’s the kind of detail covered in most solid farm management systems built around keeping livestock losses down.