Humoral immunity in the pig

Area of Science:

• Veterinary Immunology
• Neonatal Piglet Health

Background:

• Newborn pigs depend on colostrum for serum antibodies and milk for intestinal antibodies.
• Colostrum antibodies originate from serum, while milk antibodies are locally produced in the mammary gland, mirroring intestinal immunoglobulin profiles.

Purpose of the Study:

• To investigate the efficacy of different vaccination routes for stimulating antibody production in piglets.
• To understand the development of the piglet's immune system, particularly immunoglobulin production in the gut.

Main Methods:

• Comparison of intramammary, intramuscular, and oral vaccination routes.
• Analysis of antibody activity across different immunoglobulin classes and secretions.
• Histological examination of immunoglobulin-producing cells in the piglet's intestinal tract.

Main Results:

• Intramammary vaccination elicits a superior local and systemic immune response compared to intramuscular vaccination.
• Oral vaccination is also effective in stimulating antibody activity.
• Vaccination of a single mammary gland leads to antibody activity in all glands' secretions.
• Antibody activity is observed across all immunoglobulin classes regardless of vaccination route.
• The piglet's gut, specifically the lamina propria, is a primary site for immunoglobulin formation, with mature profiles developing by one month of age.

Conclusions:

• Intramammary and oral vaccination are effective strategies for enhancing piglet immunity.
• The piglet's gut immune system matures within the first month, enabling responses to oral antigens.
• Understanding these immune dynamics is crucial for optimizing neonatal piglet health and disease prevention.