Question: which antibody is present in colostrum?
Answer: Immunoglobulin A (IgA) is the major immunoglobulin in human colostrum and milk; however, it is also present in milk of most other species. Colostrum and milk IgA and IgM are found in the form of secretory IgA, or sIgA, and sIgM. Much of this is produced by plasma cells in the mammary tissue.