Diarrhea in cattle can be caused by various factors, including infections, dietary changes, and environmental stressors. Infectious agents such as bacteria (e.g., Escherichia coli, Salmonella), viruses (e.g., rotavirus, coronavirus), and parasites (e.g., coccidia) are common causes of diarrhea, particularly in young calves. These infections can result from poor hygiene, inadequate colostrum intake, and exposure to contaminated feed or water.