10/28/2026
Winter Management for the Pregnant Mare ❄️🐴
Winter management of pregnant mares involves a lot more than making sure everyone has hay and a windbreak. As we head into the colder months, it's worth ensuring we're setting our mares up for a healthy pregnancy and a successful foaling season.
🌾 KNOW WHAT'S IN YOUR HAY
Forage should be the foundation of your mare's diet, but not all hay is created equal. Feed testing gives you valuable information about its energy, protein, and mineral content, allowing you to make informed decisions about supplementation. Nutritional requirements increase significantly during late gestation, so what worked earlier in pregnancy may not be enough by the time foaling approaches.
Remember, supplements are meant to supplement a balanced diet, not replace one. Know what's in your forage before deciding what else your mare needs.
🐴 MONITOR BODY CONDITION
Winter coats can hide a lot! Regularly assess your mare's body condition by feeling over her ribs and topline rather than relying on appearances alone. Overweight mares can face additional health and metabolic challenges during pregnancy and foaling. Excess body fat can increase health risks, including having difficulty foaling, which can result in serious, potentially life-threatening consequences for both mare and foal.
Pregnancy is not an excuse to let a mare become overweight. Equally, underfeeding can leave her without the reserves needed to support pregnancy and lactation. The goal is to maintain a healthy body condition throughout gestation, adjusting her feeding program to meet her individual needs.
🩺 MONITOR FOR EARLY WARNING SIGNS
By around 8.5 of gestation, make routine mammary development checks part of your management program. Premature udder development can be an early warning sign of Placentitis, an inflammation of the placenta and an important cause of late-term pregnancy loss. While you're at it, look under your mare's tail daily, or at least every other day, for unusual vaginal discharge.
Neither sign automatically means Placentitis is present, but both warrant prompt veterinary attention. Placentitis can sometimes be treated successfully, particularly when identified early, so don't wait to see whether things progress. When something seems abnormal, call your veterinarian immediately.
💉 STAY ON TOP OF VACCINATIONS AND DEWORMING
Work with your veterinarian to establish a pregnancy-specific preventative health plan. Equine herpesvirus-1 (EHV-1), commonly called Rhino, can cause abortion in pregnant mares. Vaccination against EHV-1 is commonly recommended at five, seven, and nine months of gestation, using an appropriate vaccine and schedule under veterinary guidance.
Deworming should be based on your farm's parasite-control program, f***l testing where appropriate, and the products suitable for your mare and stage of pregnancy. Don't assume every mare needs the same product on the same schedule.
🦶 DON'T FORGET HER FEET
Pregnancy adds weight and changes the demands placed on a mare's limbs and feet. Keep up with routine farrier care, monitor for cracks, uneven wear, soreness, and changes in movement, and ensure she has safe footing around feeders, waterers, and shelters. Winter ice and frozen ruts add another layer of risk.
💧 WATER, SHELTER, AND MOVEMENT STILL MATTER
Ensure clean, accessible water is available and isn't frozen. Provide protection from wind and wet weather, adequate forage, and enough space to move comfortably. Reduced water intake during winter can contribute to digestive issues, including impaction colic, so don't overlook hydration.
The takeaway? Don't wait until foaling is around the corner to start paying attention.
Know your forage. Maintain a healthy body condition. Monitor your mare. Keep up with preventative care. Learn what's normal for her so you can recognize when something isn't right.
A few minutes of observation each day, combined with thoughtful nutrition and preventative care, can make a meaningful difference in your mare's pregnancy management.
Responsible breeding doesn't end when the mare is confirmed in foal. It means caring for her every step of the way. 🐴