Mammary gland secretions
- Mammary gland secretion has two major forms: colostrum early after birth and mature milk later after birth. Both provide nutrients and immune protection.
- Colostrum is a protein-rich, yellowish fluid produced during the first few days after birth.
- Colostrum is rich in lymphocytes, monocytes, lactalbumin, fat-soluble vitamins, minerals, and immunoglobulin A (IgA).
- Milk begins to be secreted by the third or fourth day after birth.
- It contains caseins, immunoglobulin A, lactalbumin, lipid droplets, and lactose.
- Milk ejection occurs through a reflex triggered by stimuli associated with suckling.
- The reflex releases oxytocin from axons in the posterior pituitary, causing myoepithelial-cell contraction that forces milk into larger ducts and out of the breast.
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