VX Pregnant Mares

It is important to vaccinate your brood mares 4 to 6 weeks prior to foaling. This will not only boost the mares immunity for her own protection; it will help to maximize the amount of immunity she will pass on to the foal. However, it is important to understand that vaccination of the mare alone is not enough to provide foals with sufficient protection. All foals must also receive adequate amounts of colostrum within the first 24 hours of life.

Core Vaccination Recommendations

It is recommended that mares receive ALL of the following core vaccinations prior to foaling:

  • Tetanus: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for tetanus previously, she will need 2 vaccinations 4 weeks apart prior to this time.
  • Eastern/Western Equine Encephalomyelitis: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for Eastern/Western Equine
  • Encephalomyelitis previously, she will need 2 vaccinations 4 weeks apart prior to this time.
  • West Nile Virus: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for WNV previously she should be vaccinated immediately and again 4 to 6 weeks prior to foaling.
  • Rabies: 4 to 6 weeks prior to foaling, regardless of vaccination history. If the mare has not been vaccinated for rabies previously she should be vaccinated immediately and again 4 to 6 weeks prior to foaling.
  • Rotavirus: This is a 3 dose series administered at months 8, 9, and 10.
  • Equine Herpes Virus: This is a 3 dose series administered at months 5, 7, and 9.
  • Equine Influenza: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for Influenza
    previously, she will need 2 vaccinations 4 weeks apart prior to this time.

Non-Core Vaccination Recommendations

The following vaccinations are not part of the ‘core vaccination regiment’; it is recommended that you consult your veterinarian to determine if the following vaccinations should be administered to your horse prior to foaling:

  • Strangles: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for Strangles previously, she will need 2 vaccinations 4 weeks apart prior to this time.
  • Botulism: 4 to 6 weeks prior to foaling. If the mare has not been vaccinated for botulism previously, she will need a 3 dose series administered at months 8, 9, and10. This vaccination is for mares that will be in Kentucky for breeding.
  • Colostridium: This vaccination is administered on farms where clostridial diarrhea is common in foals. It is administered 3 to 6 weeks prior to foaling, regardless of the vaccination history.

Amanda Ramseyer, DVM - 12/19/11

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