Colostrum or “beestings” is the first milk produced by the mare after foaling. It contains high levels of immunoglobulins (antibodies that are produced by the immune system to combat infections). The complex structure of the placenta prevents antibody transfer from the mare to the foal during pregnancy.

It is therefore vital that the foal receives adequate colostrum immediately after birth. This ensures that the foal is protected from infection during the first few weeks of life, as its immune system develops.