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Scours is diarrhea in a calf. Loose manure can be normal in milk-fed calves, but watery feces that soak through bedding—especially with poor appetite, depression, weight loss, or dehydration—needs prompt attention.
The immediate danger is not the manure itself. A scouring calf can rapidly lose water, electrolytes, energy, and bicarbonate, leading to acidosis, weakness, collapse, and death. Start appropriate fluid support as soon as scours is noticed, and contact a veterinarian early if the calf is not bright and willing to suck.
What causes scours in calves?
Calf diarrhea can be infectious, nutritional, or a combination of both. In calves younger than about three weeks, rotavirus, coronavirus, and Cryptosporidium account for approximately 95% of infectious cases identified by the University of Minnesota. E. coli, Salmonella, and mixed infections are also possible. A positive test does not always mean that the detected organism is the only cause of illness.
Common management triggers include:
- Not receiving enough good-quality colostrum soon after birth
- Milk replacer mixed at the wrong concentration or inadequate milk intake
- Inconsistent feeding times or sudden feed or housing changes
- Dirty bottles, nipples, buckets, tubes, milk, or water
- Overcrowding, damp bedding, poor ventilation, or stressful housing changes
- Contact with manure from older or sick calves
Manure color usually cannot identify the cause. Blood, marked straining, fever, or severe depression is more useful clinically than whether the manure is yellow, green, or gray.
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Check the calf before deciding how to treat it
Record the calf’s age, rectal temperature, attitude, suckling ability, hydration, milk intake, appearance of the manure, and any treatment already given. These details help a veterinarian judge whether the problem is mild diarrhea or a life-threatening systemic illness.
| What you see | What it means | Action |
|---|---|---|
| Standing, alert, and sucking normally | Often suitable for oral fluid support | Give a commercial oral electrolyte solution and monitor closely |
| Less eager to drink, depressed, or showing early dehydration | Condition may deteriorate quickly | Call your veterinarian and begin label-directed oral electrolytes if swallowing is normal |
| Unable to stand, recumbent, severely depressed, or unwilling to suck | May have severe dehydration, acidosis, low blood glucose, or sepsis | Seek urgent veterinary treatment; oral fluids alone may not be enough |
| Blood in the manure, abnormal temperature, or rapid worsening | Possible invasive bacterial disease or serious intestinal injury | Arrange prompt veterinary assessment |
Visible dehydration may not appear until a calf has lost roughly 6% of its body weight in fluid, according to the Merck Veterinary Manual. A calf that still stands can therefore already need treatment; recumbency, inability to stand, refusal to suck, or severe depression warrants prompt veterinary assessment for parenteral fluids.
How to treat scours at home when the calf is standing and sucking
1. Give a proper oral electrolyte solution
Use a commercial calf electrolyte product and mix it exactly as directed. A suitable solution provides sodium, an energy source such as glucose or an appropriate amino acid, potassium, and an alkalinizing agent such as bicarbonate, citrate, or acetate.
Do not guess the powder-to-water ratio. Mixing an electrolyte product too concentrated can worsen osmotic diarrhea, while an incorrectly diluted solution may not replace losses effectively.
2. Continue milk or milk replacer
Do not routinely stop milk until the diarrhea ends. Milk supplies energy for immune function, growth, and intestinal repair; electrolytes alone do not meet those needs. Give milk and electrolytes as separate feedings unless the product label and your veterinarian specifically recommend combining them.
Continue the calf’s normal feeding schedule unless a veterinarian has given you a different plan. Avoid suddenly changing milk replacers or reducing nutrition simply because the feces are watery.
3. Keep the calf warm, dry, and clean
Replace wet bedding, protect the calf from drafts, and maintain good airflow without chilling it. Remove manure promptly. A weak calf has little reserve, so warmth and easy access to clean feed and water matter while fluid losses continue.
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4. Do not force fluids into a calf that cannot swallow
Never force-feed or tube a calf that has no swallowing reflex, is lying flat, or cannot protect its airway. Improper tubing can place fluid in the lungs. Repeatedly tubing carbohydrate-containing solutions can also contribute to rumen acidosis and “rumen drinker” problems. A calf in this condition needs veterinary treatment, commonly including intravenous or other parenteral fluids.
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Call promptly if the calf:
- Cannot stand or remains recumbent
- Will not suck or cannot swallow
- Is severely depressed, cold, or unusually unresponsive
- Has sunken eyes, marked weakness, or worsening dehydration
- Has blood in the manure, a fever, an abnormally low temperature, or signs of shock
- Has diarrhea that is worsening despite oral fluids
- Is very young, was difficult to deliver, or failed to receive adequate colostrum
Severely dehydrated calves—often those with about 8% or greater dehydration—or calves that cannot stand or suck may need veterinary-administered intravenous or other parenteral fluids. Severe cases may need balanced fluids, bicarbonate, and dextrose. The amounts and infusion rates depend on the calf’s weight, hydration, blood glucose, acid-base status, and circulation. They are not safe to calculate as a universal home recipe.
Do calves with scours need antibiotics?
Diarrhea alone is not a reason to give antibiotics. Many cases are caused by viruses, protozoa, feeding errors, or mixed infections, none of which will be cured by an antibiotic. Unnecessary or prolonged antibiotic treatment can disrupt the intestine further and promote antimicrobial resistance.
A veterinarian may prescribe an antibiotic when the calf is systemically ill or septicemic—for example, with severe depression, abnormal temperature, recumbency, bloody diarrhea, or other evidence of invasive bacterial disease. The veterinarian should choose the drug, route, duration, and meat withdrawal period.
For food-producing calves in the United States, extra-label antimicrobial use requires a valid veterinarian-client-patient relationship and appropriate treatment and withdrawal instructions. Do not use leftover medicine or human antibiotics.
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Scours can be painful. A veterinarian may recommend an appropriate nonsteroidal anti-inflammatory drug to improve comfort and recovery as part of treatment alongside fluids. The veterinarian and product label must determine the product, dose, route, age restrictions, and meat withdrawal requirements.
Specific causes that require different decisions
Cryptosporidium
Cryptosporidium is a protozoan, not a bacterium. Antibiotics do not treat the underlying infection. Management centers on fluids, electrolytes, continued nutrition, warmth, and rigorous manure control. Because the organism can infect people, wash hands carefully and use appropriate protective clothing. The Merck Veterinary Manual notes that halofuginone is not registered in the United States; use only products legal and licensed for the intended use in your jurisdiction.
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Coccidiosis
Coccidiosis is more often considered in older calves, especially when there is blood, straining, or severe intestinal disease. Do not medicate an entire group solely because coccidia are detected: shedding does not always prove that coccidia caused the diarrhea. Discuss fecal testing and herd treatment with a veterinarian.
Mixed infections
Rotavirus, coronavirus, Cryptosporidium, E. coli, and other agents may occur together. Treatment still starts with the calf’s condition—hydration, suckling ability, temperature, and attitude—rather than a test result alone.
Isolation and cleaning
- Move the scouring calf to a clean, dry isolation area, without chilling it.
- Handle healthy newborns before sick calves, and care for the sick group last.
- Use separate bottles, nipples, buckets, and tubes whenever possible.
- Remove manure before washing equipment or housing.
- Wash feeding equipment thoroughly, apply a disinfectant effective for the suspected organism, and allow it to dry completely.
- Separate age groups and prevent older calves from sharing contaminated bedding, feed areas, or equipment with newborns.
Cryptosporidium oocysts are unusually persistent. A routine disinfectant may not be effective. Control depends on prompt manure removal, thorough cleaning, drying, age separation, and a product specifically labeled or licensed for the intended use.
Preventing scours starts with colostrum
Passive immunity is one of the most important defenses against early calf disease. Current Merck dairy-calf guidance recommends at least 3 liters of high-quality colostrum containing more than 50 mg/mL IgG within six hours of birth, followed by a second feeding 8–12 hours later. Another accepted approach is 4 liters within six hours. Colostrum feeding should continue through approximately three days of age.
A Brix refractometer reading above 22% is associated with colostrum containing at least 50 mg/mL IgG. Quality is not enough by itself: collect, store, warm, and feed colostrum hygienically so it does not become heavily contaminated with bacteria.
Assist weak calves and calves from difficult births rather than waiting for them to nurse later. Tube-feeding colostrum requires training. The calf should be positioned correctly, and the tube must enter the esophagus rather than the airway; do not tube a calf while it is lying down.
Improve feeding and housing routines
- Feed milk or replacer at consistent times and in consistent amounts.
- Measure water accurately and weigh replacer powder instead of estimating it by volume.
- Follow the replacer manufacturer’s mixing temperature and concentration instructions.
- Wash and sanitize bottles, nipples, buckets, and tubes between calves.
- Keep calving areas and calf pens clean and dry.
- Prevent manure from contaminating udders, colostrum, milk, feed, and water.
- Avoid abrupt changes in feed, housing, or group size.
- Ask your veterinarian about vaccination of pregnant cows as part of a broader scours-control plan.
Vaccination can increase specific antibodies in colostrum, but it cannot compensate for poor colostrum intake, dirty equipment, inadequate nutrition, or heavy pathogen exposure.
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When testing is worthwhile
Testing is particularly useful when several calves are affected, deaths occur, treatment is failing, or the pattern changes. If possible, submit fresh feces from an acutely affected, untreated calf. Iowa State University’s bovine enteric panel tests for bovine coronavirus, bovine rotavirus group A, Salmonella, K99-positive E. coli, and Cryptosporidium; the laboratory reports a typical turnaround of 1–2 days.
Test results must be interpreted alongside the calf’s age and clinical signs. Testing after oral treatments or vaccination can complicate interpretation, and detection does not automatically establish causation.
Common scours mistakes
| Claim | Why it is a problem |
|---|---|
| “Stop all milk.” | The calf loses its main source of energy. Continue milk unless your veterinarian directs otherwise. |
| “Every case needs antibiotics.” | Most uncomplicated diarrhea is not a primary bacterial infection. |
| “The manure color tells me the cause.” | Color is usually nonspecific; clinical condition is more important. |
| “Kaolin or pectin replaces electrolytes.” | Products that make feces appear firmer do not replace lost water, sodium, or energy. |
| “Crypto is bacterial.” | It is a protozoan, so hygiene and supportive care are central. |
| “A quiet calf lying down is resting.” | Depression, inability to stand, or failure to suck can signal dangerous dehydration. |
FAQ
Should I stop feeding milk to a calf with scours?
Usually no. Continue normal milk or milk replacer to provide energy, and give oral electrolytes as a separate feeding unless your veterinarian or the product label says otherwise.
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Urgent veterinary assessment is needed if the calf cannot stand, will not suck, cannot swallow, is severely depressed, is markedly dehydrated, has blood in the manure, or has an abnormal temperature.
Can I give antibiotics for calf diarrhea?
Not automatically. Antibiotics do not treat viral, nutritional, or protozoal diarrhea. A veterinarian may prescribe them when systemic bacterial disease or septicemia is suspected.
How can I prevent scours in newborn calves?
Provide clean, high-quality colostrum quickly, keep feeding equipment and pens clean and dry, mix milk replacer accurately, avoid abrupt feed changes, separate age groups, and follow a veterinarian-designed vaccination program.
The Bottom Line
Treat the calf, not just the manure: replace fluids and electrolytes early, continue milk nutrition, keep the calf warm and isolated, and never force fluids into one that cannot swallow. A calf that is down, not sucking, severely depressed, dehydrated, bloody in the manure, or unusually hot or cold needs urgent veterinary care. Prevention depends on timely hygienic colostrum, consistent feeding, clean equipment, dry housing, age separation, and a farm-specific disease-control plan.
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