Immunological castration is an FDA-approved form of managing boar taint, which is an unpleasant aroma or taste that can occur in cooked pork from some mature male pigs. Immunological castration works like an immunization, using the pig's natural immune system to temporarily create antibodies that prevent the biological cascade that leads to the development of androstenone and skatole, which are the substances responsible for causing boar taint.
Immunological castration is distinctly different than chemical castration and should NOT be confused with or referred to as chemical castration.