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Quick answer: Calf scours (neonatal calf diarrhoea) is the leading cause of death in calves under one month of age. It is rarely caused by a single germ — poor colostrum intake, a dirty calving environment, cold or wet housing and stress all set the stage for infection. The biggest killer is not the diarrhoea itself but the dehydration and electrolyte loss it causes, so prompt oral rehydration, good colostrum management and strict hygiene are the foundations of prevention and recovery. Always involve your veterinarian, especially if a calf is weak, very dehydrated or stops drinking.
Scours is the common name for diarrhoea in young calves, usually appearing in the first three weeks of life. Common infectious agents include rotavirus, coronavirus, E. coli, Cryptosporidium and Salmonella. These spread through manure-contaminated bedding, feeding equipment, teats and hands. A calf with watery, pale or blood-tinged faeces rapidly loses fluid, salts and energy, becomes weak and sunken-eyed, and can die within a day or two if not supported — which is why early action matters so much.
When a calf scours, it loses water and electrolytes (sodium, potassium, chloride and bicarbonate) far faster than it can replace them, and its blood becomes acidic. Signs of dehydration include sunken eyes, a dry muzzle, skin that stays tented when pinched, weakness and refusal to suckle. Restoring fluids and electrolytes is often more life-saving than any other single step.
Give a good-quality oral rehydration solution (ORS) between milk feeds to replace lost fluid and electrolytes. Unless your veterinarian advises otherwise, continue feeding milk or milk replacer as well — withholding milk entirely slows recovery and energy supply. A severely dehydrated or collapsed calf that will not drink needs intravenous fluids from a veterinarian without delay.
Alongside rehydration, herbal digestive support can help firm the stool and restore appetite. Products such as Idavet Suspension and Idavet DS are formulated to support digestive health in cattle; see how they are used in our article on controlling diarrhoea and improving digestion, and our wider digestive powder guide. Use any product as directed and alongside veterinary advice.
Separate scouring calves from healthy ones to limit spread, and keep them warm and dry on clean bedding. A sick calf loses body heat quickly, especially in cold or wet conditions.
Colostrum is the calf's only source of protective antibodies. Follow the "1-2-3" approach: the first feed within the first 1–2 hours of birth, around 2 to 3 litres of good-quality clean colostrum, and continue colostrum/transition milk for the first 3 days. A calf that misses early colostrum is far more likely to scour and to fall sick in general.
Calve in a clean, dry area, dip the navel in an antiseptic at birth, and house calves on dry bedding that is cleaned regularly. The fewer manure-borne organisms a newborn meets, the lower the infection pressure.
Clean and disinfect buckets, bottles, nipples and tube feeders after every use. Dirty equipment is one of the most common ways scours pathogens reach the calf.
Well-fed dams in good body condition produce better-quality colostrum. Sound mineral and overall herd nutrition in the dry and transition period supports both the cow and her calf.
Contact your vet promptly if a calf is markedly dehydrated, weak or unable to stand, stops drinking, has blood in the faeces, runs a fever, or does not improve within a day of oral rehydration. Calves can deteriorate very fast, and professional treatment — including intravenous fluids and a correct diagnosis — can be the difference between life and death.
Usually no. Continue milk or milk replacer and give oral rehydration solution in between feeds, unless your veterinarian specifically advises otherwise. Withholding milk removes the energy the calf needs to recover.
Aim to give the first colostrum within 1–2 hours of birth, roughly 2–3 litres of clean, good-quality colostrum, and continue colostrum or transition milk over the first three days. Early, adequate colostrum is the single most effective scours-prevention step.
Yes. Many scours pathogens are highly contagious through manure, bedding, equipment and hands. Isolate affected calves, clean and disinfect equipment, and maintain strict hygiene to protect the rest of the group.
For detailed, evidence-based guidance, consult the Indian Council of Agricultural Research (ICAR), the National Dairy Development Board (NDDB) and the Food and Agriculture Organization (FAO). This article is for general educational purposes only and does not replace professional veterinary advice — always consult a qualified veterinarian for diagnosis and treatment.
