Q.What is colostrum? Name any one of the disease resisting antibodies present in it.

Colostrum is the first milk (early lactation, first 2–3 days post-partum), yellowish and antibody-rich; it passively immunises the newborn. A key protective antibody in it is IgA.

After parturition, before true milk (lactation proper) begins, the mammary glands secrete a special fluid called colostrum for the first two to three days.

• What it is: a thick, yellowish secretion, lower in fat and sugar than mature milk but much higher in proteins, minerals and, crucially, antibodies.
• Why it matters: the newborn's own immune system is not yet mature, so colostrum provides passive immunity — ready-made maternal antibodies protect the infant against infections during the vulnerable first days. This is why breast-feeding of colostrum is strongly recommended. …