Diarrhea is one of the most common and costly problems in preweaned calves, and prevention usually gets more attention than treatment once it's already happening. This review looks specifically at colostrum's potential not just as a preventative measure but as an actual therapy once diarrhea has set in. For producers dealing with an active case, not just trying to avoid one, this is worth a look at what the evidence actually supports beyond standard supportive care.
"A Narrative Review on the Unexplored Potential of Colostrum as a Preventative Treatment and Therapy for Diarrhea in Neonatal Dairy Calves" — H.S.M. Carter, D.L. Renaud, M.A. Steele, A.J. Fischer-Tlustos, J.H.C. Costa. Animals. 2021;11(8):2221.