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The Mare: Pregnancy Trimesters 1 – 3

By June 18, 2018April 27th, 2020Brood Mares, Foals, Horses
Horses | Pro Earth Animal Health

First Trimester Care for Pregnant Mares– A Confirmed Pregnancy

The first trimester of your mare’s pregnancy starts on the day of conception and ends at day 113.  During the first trimester, her nutritional requirements will be basically the same as they were before she became pregnant.

Equine Nutrition for a Healthy Mare & Healthy Foal

To ensure that your mare maintains a healthy weight, she can be maintained on high-quality forage, pasture or hay and unlimited access to a mineral salt block. If she’s a “hard-keeper”, supplementing with a concentrated feed and keeping her stomach pH balanced will help to maintain her body condition score and digestive integrity.

Consult Your Veterinarian: Vaccines and Deworming During the First Months of Pregnancy

During this first trimester, best practices from the College of Veterinary Medicine dictate that she not receive vaccinations in this period of time. It is, however, recommended that she be dewormed sometime between days 60-90.

Mares Energy and Workload Precautions

While the dietary needs for your mare may not change much if, at all, special precautions should be taken to protect the newly-implanted pregnancy during the first 30 days.

These precautions include things such as reducing her workload and avoiding any high-intensity exercise. This is particularly important on hot days or when there may be hauling or new surroundings involved.

Second Trimester Care – Maintaining Good Body Condition

The second trimester for your mare begins on day 114 and goes until day 225. This is sort of the “coasting” period. She can resume her regular workload (within reason) and shouldn’t have any energy deficits.

Veterinary Medicine: Mares Should Be Vaccinated During the Second Trimester

During the second trimester, your mare should receive a total of two EHV-1 vaccinations to protect your mare from the common Equine Herpes Virus. One should be administered on day 150 of the pregnancy, along with a second deworming. The second EHV-1 should be administered on or around day 210.

Feeding Your Mare In the Second Trimester of Pregnancy

Maintaining your mare during her second trimester includes providing a generous amount of high-quality hay and just enough grain or concentrated feed to keep her in moderate body condition. You may also need to add a feed supplement (vitamin and mineral supplement) to ensure that all of her nutritional requirements are being met.

Third Trimester Care – The Home Stretch Gestation Period

The third, and final trimester for your mare runs from day 226 until around day 340 – the average foaling date.  This trimester is undisputedly the most important trimester in terms of fetal growth and development.

The first two trimesters of your mare’s pregnancy will be relatively easy with regards to care and support. Now that she is in the final stage, she is going to require more care and attention.

Mares Nutritional Requirements Increase

Due to the rapid growth of the fetus towards the latter part of the pregnancy, the nutritional needs of your mare will increase by about 30%.  It is imperative to concentrate on the vital nutrients, vitamins, and mineral content of her feed – this is so much more important than just calories.

Vaccines in the Third Trimester of Equine Pregnancy

During this third and final stage of pregnancy, your mare will need to receive the most important set of vaccinations, known as “Pre-foaling” vaccinations.  These vaccinations are primarily for establishing a solid immune system in the foal, however, the mare certainly benefits from these vaccinations as well.

The administration of these vaccines during this time will help ensure that your mare produces high levels of antibodies that will provide the immunity-boosting building blocks of her colostrum.

Monitoring Your Mare in the Weeks Before Foaling

Monitor your mare regularly when she’s close to term. By “regularly” that means “continually”, as in every hour.  It is particularly important to pay attention to anything that seems off.

The number one sign to look for is if your mare is lying down more than usual. Her appetite may also decrease or she may seem painful. Another thing to watch for is an abnormal vaginal discharge that may lead to infection and can be fatal to the foal.

Contact Your Veterinarian If You Have Concerns

The last part of the pregnancy can be an exciting, nerve-wracking time, to say the least.  Always go with your gut – if something seems alarming, contact your veterinarian right away. It is always better to be safe than sorry.

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