Diarrhoea in Young Calves: Hydration, Continued Nutrition and Herd Records
Reviewed by medical articles. Educational information, not an individual diagnosis or prescription.
Diarrhoea in Young Calves: Hydration, Continued Nutrition and Herd Records
**Animal:** Cow
**Topic:** Young calf digestive health
**Researched:** 28 October 2026
**Editorial status:** Researched draft; veterinary review pending.
**Suggested URL:** /cow/calf-diarrhoea
**Meta description:** Recognise a sick scouring calf, understand why electrolytes do not replace milk nutrition and organise veterinary-led treatment and prevention.
Diarrhoea in a young calf, often called scours, can lead to serious dehydration and illness. The cause may be infectious, nutritional or involve several factors. Treatment decisions should consider the calf's overall condition, not just the colour of the manure. A calf that cannot stand or feed normally needs prompt veterinary assessment. [1]
This guide supports farm observations and an agreed treatment protocol. It does not give an injectable fluid recipe, antibiotic dose or instructions for untrained stomach-tube feeding.
Look at the calf as well as the manure
Record age, alertness, ability to stand, willingness to suckle, recent intake and the start of diarrhoea. Tell the veterinarian about blood, marked weakness, breathing changes and whether several calves are affected. The appearance of manure alone does not reliably identify the pathogen. [1]
Use the calf's identification on every record and sample. A group description such as “the small brown one” can lead to confusion when several workers provide care. Note when each calf was last seen behaving normally and whether treatment has already been given.
When to seek urgent help
Call promptly if the calf cannot stand, is severely depressed, will not drink or appears to be deteriorating. Some calves require intravenous fluids and close monitoring rather than oral treatment alone. [2]
Ask for transport or on-farm instructions while help is arranged. Do not force large volumes into a calf that cannot swallow appropriately. Tube feeding and intravenous treatment require trained personnel and a veterinary protocol; they should not be improvised from a written article.
If the farm already has a treatment protocol, check whether the calf meets its criteria. A protocol for an alert, drinking calf does not automatically cover a collapsed patient.
Milk and electrolytes have different jobs
Electrolytes help address fluid and electrolyte losses, but they do not meet all of a calf's energy requirements. Merck advises that milk should not be withheld simply because diarrhoea is present. The veterinarian should specify the milk and electrolyte plan for the individual calf. [2]
Ask which electrolyte product to use, how it is mixed and how its timing relates to milk feeds. Do not add extra powder to make it stronger or assume all products are interchangeable. Record how much was actually consumed, not merely how much was prepared.
If a calf nurses its dam, confirm that it is genuinely taking milk. Standing near the udder is not proof of adequate intake. If bottle-fed, review mixing accuracy and preparation records with the veterinary team.
Investigate feeding consistency
Milk-replacer concentration, mixing, temperature and feeding routine can affect calf health. University extension guidance emphasises consistent preparation and accurate measurement rather than estimating powder by eye. [1]
Review the equipment used by every worker. Does the measuring container match the written instructions? Is powder weighed, and is the final volume understood? Are changes in product or water supply recorded? These questions are more useful than blaming a worker without examining the process.
Keep the current bag and batch details when a problem occurs. Do not switch all calves abruptly to another product without discussing the reason and transition plan.
Medicines need clinical justification
Diarrhoea alone does not establish a need for antibiotics. Systemic illness or another finding may change the treatment decision. Use the farm veterinarian's protocol and record the indication, product, administration and any food-chain restrictions that apply. [2]
Do not borrow a prescription from another farm or use an old dose because the calf looks similar. If the calf fails to respond, contact the veterinarian rather than adding several products at once.
Ask what improvement is expected and when reassessment is needed. A calf may need a revised hydration or nutrition plan even if manure remains loose, so judge the whole animal.
Reduce spread and protect people
Some causes of calf diarrhoea can infect people. Arrange handwashing, appropriate protective clothing and careful handling of contaminated bedding and equipment. Keep children and vulnerable visitors away from sick-calf areas and discuss the particular risks with the veterinarian. [2]
Use a practical order of care and equipment plan to reduce cross-contamination. Make sure isolation does not leave a sick calf without observation, appropriate shelter or access to treatment. Explain the system to relief workers, not only permanent staff.
Review the herd, not just one episode
Record cases by age, pen, birth period and outcome. Review colostrum management, dam health, housing hygiene, feeding and vaccination with the veterinary team. Scours prevention is a system-wide task; one product cannot correct every weakness. [1]
Ask which samples would be useful and how to collect and store them. Do not submit an unlabelled sample after multiple treatments without telling the clinician what was given.
**Should milk stop until the stools are normal?** Do not withhold milk automatically; obtain the combined nutrition and rehydration plan.
**Can stool colour choose the antibiotic?** No. Clinical assessment and, where appropriate, diagnostic testing guide treatment.
**When is recovery complete?** Follow the veterinarian's criteria, including hydration, feeding, activity and growth, rather than one improved manure sample.
Sources
[1] [University of Minnesota Extension: Dairy Calf Scours](https://extension.umn.edu/agriculture/animals-and-livestock/dairy/dairy-calf-scours)
[2] [Merck Veterinary Manual: Diarrhea in Neonatal Ruminants](https://www.merckvetmanual.com/digestive-system/intestinal-diseases-in-ruminants/diarrhea-in-neonatal-ruminants)