Calf's Choice Total Colostrum HiCal 700gm bag, Calf's Choice Total Colostrum is made only from natural, premium quality bovine colostrum. It is an excellent source of IgG (over 85% in the form of IgG1), colostral fat, growth factors, and nutrients needed to improve calf survival, health, growth, and long term performance. Not a manufactured formula based on blood serum, whey, eggs, vegetable fats or other ingredients not naturally found in colostrum.