Fuente: WIPO "dairy products" A process for the preparation of a liquid or semi-liquid bioactive dairy composition containing 20-90% retained bioactive IgG, for use as an ingredient in a ready-to-eat (RTE) or ready-to-drink (RTD) food product, includes the steps of a) combining a bioactive powder containing a colostrum powder and/or milk powder containing whey proteins, and immunoglobulin G (IgG), wherein the ratio of whey protein: IgG in the bioactive powder is between 1.74:1 and 3.05:1; water and a food grade acid to form a bioactive dairy composition with a pH of 2.5-4.0, and b) heat treating the bioactive dairy composition to between 67-145° C. at ambient pressure.