Submitted by Old Site on Tue, 2012-10-23 23:20
Colostrum or "first milk" is the thick, yellow secretion from the mammary gland, present immediately after birth. Produced in the mare's udder during the last two to four weeks of gestation in response to hormonal changes, colostrum contains concentrated immunoglobulin (antibodies) from the mare's serum. Colostrum and its protective antibodies are present in the mare's milk for only the first day after foaling; these maternal antibodies are necessary to protect the foal against infectious diseases. For various reasons, breeders may need or opt to collect colostrum.