Calf Scours: Prevention and Treatment

Scours, or diarrhea in young calves, can take a calf from lively to dangerously dehydrated in a short time. Prevention is about clean ground, good colostrum, and quick action.

Key points

Scours is a sign with several possible causes, so ask about testing.
Early colostrum and clean calving ground are the best prevention.
Dehydration is the main danger, so act quickly.
Call your vet early and follow all treatment and withdrawal instructions.
Wash up, since some causes can affect people.

What causes scours

Scours is a sign, not a single disease. Viruses, bacteria, and protozoa can all cause it, and several often act together. Environment, nutrition, and the calf's immunity decide whether exposure turns into illness.

Only a lab test can tell which germ is involved, and that matters because the right response differs. Ask your vet about testing when scours shows up, especially if several calves are affected.

Age often gives a clue. Scours in very young calves tends to have different causes than scours in calves a few weeks older, and your vet can use age, season, and herd history to narrow the possibilities.

Why calves get sick

The big risk factors are not enough colostrum, a dirty or crowded calving area, wet and muddy weather, and cold stress. A calf that does not get colostrum early is much more vulnerable to everything.

Cow condition is part of the picture too. Thin cows or cows in poor nutrition can have weaker calves and less colostrum quality, so feeding the cow well before calving is prevention for her calf.

Calves that are born into crowded, contaminated conditions get a heavy dose of germs early, before their own defenses are working. Giving them space and a clean start lowers that dose.

Delayed or inadequate colostrum
Muddy, crowded calving ground
Cold, wet weather
Calves exposed to older calves with scours
Thin or poorly fed cows
Dirty feeding equipment

Prevention on the ranch

Give cows clean, well-drained ground to calve on, and spread them out. Where possible, move pairs to fresh pasture after calving so young calves are not walking through the manure of older ones. Keep bunks and waterers clean.

Work with your vet on cow vaccination timing before calving, because it affects the antibodies passed through colostrum. Make sure every calf nurses early and watch heifers and cows with poor udder shape.

Separate heifers and cows when calving so that first-calf heifers, which are more likely to have slow births and slow nursing, get closer attention. Spread calving over a shorter, tighter season if you can, so fewer age groups mix in one pasture.

Signs to watch for

Look for loose or watery manure, a dirty tail, a hunched stance, weak suckling, sunken eyes, and a calf that is slow to stand. Dehydration is the real danger. A calf that is cold, lying down, and not interested in nursing needs help quickly.

Walk through calves daily. Early attention lets your vet help while the calf is still strong.

Note how the calf nurses and stands, not only the manure. A calf that stops nursing is telling you something is wrong even before diarrhea becomes severe.

What to do when a calf scours

Call your vet early, and do not wait to see if the calf improves. Your vet can tell you how to support the calf with fluids and warmth and whether the calf needs treatment. Specific treatment decisions, products, and amounts belong to the vet.

Move the sick calf away from the herd if you can, keep it dry and warm, and wash your hands and boots afterward since some causes of scours can affect people. Treated animals need their withdrawal times followed exactly.

Records and review

Record every scouring calf: ID, dam, age, date, signs, and outcome. If you see a pattern in age, pasture, or group, that is a clue to a source. Ask your vet about lab samples and post-mortem exams on calves that die, because knowing the cause can change your plan for next year.

Review calving ground, colostrum, and cow nutrition at the end of each calving season.

Share your records with your vet each year, along with your calving dates and cow condition scores on the 1-to-9 scale, so you can plan changes for the next calving season together.

Common mistakes

Waiting, leaving sick calves with the herd, reusing dirty tubes or bottles, and calving in the same muddy lot every year are the usual causes of bad outbreaks. Treating without a diagnosis or without vet advice can also make things worse. Clean equipment between calves and keep your own hygiene in check.

When to get help: Call your veterinarian at the first sign of a scouring calf, especially a weak or cold one, or if more than one calf is affected. Do not give treatments on your own, and follow withdrawal times exactly after any vet-directed treatment.

Sources and further reading

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