Bovine Neonatal Diarrhea: Welfare and Prevention in Calves

Key Facts

• Neonatal diarrhea (scours) kills more calves than all other diseases combined in beef and dairy systems
• Rotavirus, coronavirus, Cryptosporidium, and E. coli are the primary causative agents
• Dehydration and metabolic acidosis — not the diarrhea itself — are the primary causes of death
• Oral rehydration therapy (ORT) is the cornerstone of treatment — IV fluids for severely depressed calves
• Colostrum management (quality, quantity, timing) is the single most effective prevention strategy

Welfare Considerations

Neonatal calf diarrhea causes profound welfare suffering. Dehydrated calves become progressively weaker, unable to stand, and eventually comatose before death. The suffering is prolonged because the deterioration happens over 24-72 hours without intervention. Early oral rehydration reverses dehydration and acidosis rapidly and humanely. The welfare case for aggressive early treatment — including IV fluids when oral therapy is insufficient — is overwhelming. Prevention through excellent colostrum management, hygiene, and vaccination of dams eliminates most cases entirely.

What You Can Do

• Ensure all calves receive 3-4L of high-quality colostrum within 6 hours of birth
• Monitor all calves twice daily for the first two weeks for signs of diarrhea and dehydration
• Begin oral rehydration therapy immediately when diarrhea is detected — do not wait for worsening
• Train farm staff to assess dehydration severity and escalate to IV fluids when indicated
• Vaccinate dams against scours pathogens in late pregnancy to boost colostral antibody levels