Анотация: The sequence of development of porcine systemic and local humoral and cellular immunity was analyzed by the age-dependent patterns of total serum immunoglobulin (Ig) levels, responsiveness of peripheral blood lymphocytes (PBL) to common mitogens (phytohemagglutinin, PHA; concanavalin A, ConA; poke-weed mitogen, PWM), or allogeneic PBL in a mixed lymphocyte culture (MLC), and the expression/distribution patterns of intestinal mucosal immune cell subsets, in order to establish the basic immune parameters for an assessment of immunocompetence in clinically normal pigs. Thus, we surveyed the species-related physiological values of these parameters in different age/technological categories, comprising infant (suckling and weaned pigs) and adult (gilts, sows, and boars) swine, kept in intensive rearing conditions