Cattle Neonatal Calf Diarrhoea: Prevention, Treatment, and Welfare

Neonatal calf diarrhoea (scours) is the most common cause of calf death in the first month of life, causing severe dehydration and metabolic acidosis that requires prompt oral or intravenous fluid therapy.

Key Facts

Scours accounts for over 50% of pre-weaning calf deaths in beef herds and significant mortality in dairy systems.
Causative agents include rotavirus, coronavirus, Cryptosporidium parvum, and enterotoxigenic E. coli.
Clinical signs appear from day 1 (E. coli) to day 5-15 (Cryptosporidium, coronavirus) after birth.
Dehydration, metabolic acidosis, and electrolyte imbalances cause progressive weakness, recumbency, and death.
Oral electrolyte solutions administered early are effective for mild to moderate cases and are cost-effective.
Colostrum management is the single most important preventive intervention — adequate intake within 6 hours of birth.
Environmental hygiene in calving areas significantly affects infectious load and disease incidence.

Welfare Considerations

Neonatal calf diarrhoea causes rapid, severe suffering — calves become weak, unable to stand, dehydrated, and acidotic within hours. Without treatment, affected calves die in considerable distress. The welfare tragedy is that most cases are preventable through adequate colostrum management, clean calving environments, and vaccination of cows against key pathogens before calving. Treatment must be prompt — waiting to see if a scouring calf improves without intervention typically results in deterioration to a point where recovery is more difficult and welfare harm is greater. Farmers should have oral electrolyte solutions on hand and know how to administer them to provide immediate welfare relief.

What You Can Do

Ensure all calves receive adequate colostrum within 6 hours of birth — this is the most critical welfare intervention.
Maintain colostrum banks from high-quality cows to supplement calves from dams with poor colostrum quality.
Have oral electrolyte solutions on hand and administer promptly at first signs of scouring.
Vaccinate cows against rotavirus, coronavirus, and E. coli before calving in herds with endemic scours problems.