Contains 100 grams IgG. Made from whole bovine colostrum to ensure calves receive valuable antibodies needed for immunity. Colostrx CR is licensed as a USDA Vet-Bio to aid in the treatment of failure of passive transfer of immunity in newborn calves. Colostrx CR can be fed to critical calves needing both immune support and energy to stay warm and thrive. Colostrx CR can be used to completely replace maternal colostrum (feed 2 bags). In addition to 100g IgG, Colostrx CR provides important nutrients that help develop a healthy digestive tract and get calves started right!