Producers understand neonatal calf diarrhea is a problem on their farms. National Animal Health Monitoring System data from 2007 reported an average calf mortality of 8% annually, with scours as the leading cause of death in unweaned calves at 56.5%. Most causes of scours are preventable. However, the infectious causes of neonatal diarrhea are typically bacteria, viruses or protozoa. Other noninfectious causes that may contribute to neonatal diarrhea are:
■ poor-quality colostrum
■ poor sanitation
■ stress
■ inadequate ventilation
■ adverse weather conditions