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Calf pneumonia is a fast-moving infection of the lungs that shows up as fever, fast breathing, nasal discharge, cough and a dull calf that stops drinking milk. It is one of the two biggest killers of calves in India (with scours), and damp, poorly ventilated monsoon sheds are its favourite breeding ground. Caught in the first day, most calves recover well with veterinary treatment; caught late, the lung damage is permanent — so knowing the early signs is worth more than any medicine.
Veterinarians call it enzootic calf pneumonia: a mixed infection in which viruses and mycoplasma irritate the airways first and bacteria then invade the weakened lung. The germs are common — what decides whether a calf falls sick is stress and environment: poor colostrum intake in the first hours of life, damp bedding, ammonia smell from urine-soaked floors, overcrowding, chilling draughts at calf level, and sudden weather swings in the monsoon and early winter.
A useful habit for any calf shed: run a hand over every calf morning and evening, and take the temperature of any calf that looks even slightly dull. In groups, the first sick calf usually means others are incubating it.
A calf that drinks 10% of its body weight in good colostrum within the first 6 hours has the antibodies to resist respiratory germs for weeks. Weak colostrum intake is the single most common thread in pneumonia outbreaks. See our full colostrum management guide.
Ammonia and moisture destroy the airway's defences. Sheds should smell fresh at calf height (kneel and sniff — if your eyes sting, it is worse for the calf). Open ridge and side ventilation above calf level, while solid barriers stop wind blowing directly on calves.
In the monsoon, wet bedding is almost guaranteed pneumonia. Use raised, drained floors or thick bedding changed before it goes damp; a simple knee test — kneel for 20 seconds, and if your knee comes up wet, the bedding is too wet.
Older animals shed germs that young calves cannot yet handle. House calves separately from adults, keep group sizes small, and quarantine newly purchased animals.
For cough and cold support in growing calves and adult animals, a herbal respiratory supplement such as Cattle Remedies CufCRIL can be used alongside veterinary treatment, per label directions and your vet's advice. Keep worm and scours pressure down too — a calf recovering from calf scours is a prime pneumonia candidate.
Fever above 39.5°C, breathing faster than about 40 breaths a minute at rest, nasal discharge, a dry cough and a dull calf that drinks less milk. Fever usually comes first — check temperature on any dull calf.
No. Home nursing — warmth, dryness, isolation and feeding — is essential support, but bacterial pneumonia needs prescription medicines chosen and dosed by a veterinarian. Delay or leftover antibiotics usually mean permanent lung damage.
Damp bedding, high humidity, ammonia build-up in closed sheds and sudden temperature swings all weaken the calf's airway defences, while the wet shed keeps germs alive. Ventilation and dry bedding remove most of that risk.
This article is general educational information for dairy farmers and is not a substitute for veterinary advice. Pneumonia is an emergency in young calves — always involve a qualified veterinarian early. Cattle Remedies products are herbal supportive care and work best alongside good housing, colostrum management and veterinary treatment.
