FIRST COLOSTRUM is used to aid in the treatment of failure of passive transfer of immunity in newborn calves. FIRST COLOSTRUM also has one full dose of Escherichia coli antibody along with 50 grams of bovine origin IgG in a 350 gram feeding to aid in the prevention of death associated with E. coli K99. This colostrum supplement for neonatal beef and dairy calves is suitable for the first or second feeding of colostrum. All natural and Anti-biotic FREE. Meets the stringent standards of the USDA-Center for Veterinary Biologics.