Fuente: WIPO "milk" The invention is a method for providing milk having an elevated IgG level. It involves implanting intramuscularly and subcutaneously within a bovid mammal an antigenic substance to elicit a hyperimmunisation response. The antigenic substance is incorporated within shaped microparticles of a biocompatible matrix material which causes controlled release of the antigen. This prolongs antigenic activity within the bovid mammal. Milk having an elevated, higher than normal level of IgG antibody is obtained from the bovid mammal. This method provides milk with higher antibody titre and lymphokinen levels than can be achieved by conventional procedures.