Methods of priming a Sus’ immune system are disclosed. The methods comprise administering an effective amount of a Mycobacterial whole cell lysate to a Sus within an effective period of time after the Sus is born.本發明揭示引發豬屬動物之免疫系統之方法。該等方法包括於豬屬動物出生後之有效時段內向該豬屬動物投與有效量之分枝桿菌全細胞溶解產物。