Do cows produce colostrum while pregnant?

Yes, cows produce colostrum while pregnant. Colostrum is a thick, yellowish fluid that is produced by the mammary glands of cows and other mammals in the last few weeks of pregnancy and for a few days after birth. It is high in protein, antibodies, and other nutrients that are essential for the newborn calf. Colostrum helps the calf to develop a strong immune system and to fight off infections.