Calf Scours: Prevention, Hydration, and Treatment

Scours is diarrhea in young calves, and the real danger is dehydration. Prevention starts at calving, and quick, correct support while you wait for your vet can save a calf.

Key points

Dehydration is what kills most scouring calves.
Prevention begins with dry cow care, clean calving and colostrum.
Check hydration daily using signs your vet has shown you.
Use calf electrolyte products as labeled and ask about feeding during scours.
Your vet decides on medicines and fluids; follow withdrawal times.

What scours is and what causes it

Calf scours is a symptom with several possible causes: viruses, bacteria, protozoa, and feeding or management problems. Often more than one is involved. The cause cannot be told by looking at the manure, so a lab test may be needed.

Most calves that die from scours do so from fluid and salt loss, not just from the germ.

Scours is among the most common reasons calves need extra care, so a clear plan written with your vet saves time on the day it counts.

Prevention starts before birth

Good protection builds from the dry cow upward: well-fed dry cows in good condition, clean calving pens, prompt and enough colostrum, clean feeding equipment and calf housing that is dry, draft-free and not crowded.

Ask your vet whether a dry cow vaccination program fits your herd. It is one layer and does not replace clean management.

Keep calving areas free of heavy manure build-up, and move cows out of the maternity pen soon after calving so calves are not exposed to a dirty area.

Clean, dry calving pens
Colostrum soon after birth
Individual calf housing that is cleaned between calves
Consistent feeding times and mixing
Separate sick calves and handle them last

Spotting dehydration

Watch calves every day at feeding. Signs of trouble include a calf that is slow to get up, weak suckle, sunken eyes, dry gums, cold legs and ears, or skin that stays tented when pinched. Ask your vet to show you how to check hydration and use a scoring chart.

Early signs come before the calf cannot stand. Calves that cannot stand, are cold or are not sucking need immediate veterinary help.

Hydration support

Oral electrolyte solutions replace fluids and salts. Use a product made for calves and follow the label for mixing and timing. Do not make your own mixes without veterinary guidance, because wrong ratios can harm the calf.

Electrolytes are generally given in addition to milk or milk replacer, not instead of it, unless your vet says otherwise. Ask your vet exactly how to handle feeding during scours.

Keep a stock of calf electrolyte products where everyone can find them, and check expiry dates and label directions at the start of each season.

What your vet will decide

Whether a calf needs medicine, intravenous fluids or lab testing is a veterinary decision. Antibiotics do not help every case of scours, and wrong use can make things worse. This guide gives no drug names or doses.

If you treat calves under a vet's plan, keep a record of what was given, when and by whom. Milk and meat withdrawal times on the label or set by your vet must be followed exactly.

Protecting people and the herd

Some germs that cause scours can infect people. Wash hands thoroughly after handling calves, wear gloves, keep children away from sick calves and keep boots and equipment for sick calves apart.

Clean and disinfect pens, bottles and buckets between calves, following label directions for disinfectants.

Anyone who has had diarrhea after working with calves should see a doctor and mention the livestock contact.

Records and review

Track how many calves scour, their age at onset, which pen they came from and what happened to them. Patterns, such as most cases at a certain age or from one barn, help your vet find the cause. Ask for a herd review of colostrum and sanitation if the problem repeats.

When to get help: Call your vet the same day for any scouring calf that is weak, off milk or sunken-eyed, and straight away for a calf that cannot stand. Treated-calf milk and meat withdrawal times must be followed exactly.

Sources and further reading

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

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