Immunoglobulin-containing cells in pig mammary gland

Peroxidase-labelled antisera to pig immunoglobulins A, G and M were used to study immunoglobulin-containing cell populations in pig mammary gland at different stages of gestation and lactation. Immunoglobulin-containing cells of all three classes were present several weeks before farrowing; IgA-containing cells were most numerous at all stages of lactation.