How long should a foal effectively ingest and absorb colostrum after birth?

How long should a foal effectively ingest and absorb colostrum after birth?

• A. 6-12 hours
• B. 12-18 hours
• C. 18-24 hours
• D. 24-36 hours

Answer: (B)

The key idea is passive transfer of immunity from mare to foal through colostrum and the limited window during which the foal’s gut can absorb the immunoglobulins. Right after birth, the foal’s intestines are permeable to large molecules like IgG, allowing intact antibodies from colostrum to be absorbed. This permeability declines with time as the gut “closes,” so the opportunity to take in and utilize those antibodies is time-restricted. The best window for effective absorption is roughly 12–18 hours after birth. Within this period, the foal can take up a meaningful amount of IgG, providing passive immunity. By about 24 hours, absorption has diminished considerably, making colostrum intake less reliable for achieving adequate passive transfer. Therefore, ensuring the foal ingests colostrum early, preferably within the first half day, maximizes the chance of strong passive immunity.

The key idea is passive transfer of immunity from mare to foal through colostrum and the limited window during which the foal’s gut can absorb the immunoglobulins. Right after birth, the foal’s intestines are permeable to large molecules like IgG, allowing intact antibodies from colostrum to be absorbed. This permeability declines with time as the gut “closes,” so the opportunity to take in and utilize those antibodies is time-restricted.

The best window for effective absorption is roughly 12–18 hours after birth. Within this period, the foal can take up a meaningful amount of IgG, providing passive immunity. By about 24 hours, absorption has diminished considerably, making colostrum intake less reliable for achieving adequate passive transfer. Therefore, ensuring the foal ingests colostrum early, preferably within the first half day, maximizes the chance of strong passive immunity.