What Is a Mare? A mare is an adult female horse that is typically over four years of age.
This term is used to distinguish female horses from males, with “stallion” referring to an intact male and “gelding” to a castrated male.
In the world of equine terminology, knowing the difference between these terms is essential for horse owners, breeders, and enthusiasts.
Understanding the Term “Mare”
In the equine world, gender plays a significant role in identifying the behavior, care, and roles of a horse. A mare, being a mature female, often holds a prominent position, particularly in breeding, herding, and even competitive events.
Differences Between Mares and Other Horses
Mares differ from stallions and geldings in both behavior and physiology. Here are a few key distinctions:
- Stallions: Male horses that have not been castrated are referred to as stallions. They tend to exhibit more dominant behavior and can be more challenging to handle due to their high testosterone levels.
- Geldings: Castrated male horses are called geldings, known for their calmer and more predictable temperament compared to stallions.
For more on understanding horse behavior and differences, check out our guide to equine care.
Learn more about horses on Wikipedia.
Mares in Breeding
Mares play a critical role in horse breeding programs. When a mare becomes pregnant, she is often referred to as “in foal.” A mare’s pregnancy lasts for about 11 months, and she typically gives birth to a single foal at a time.
- Breeding Mares: Mares that are specifically bred to produce offspring are known as broodmares. These mares are often chosen based on their lineage, temperament, and performance history in various equestrian sports.
According to Dr. Jane Manfredi, an equine veterinarian, “Mares often exhibit strong maternal instincts and play a crucial role in the development of foals. Their health and well-being are paramount in breeding programs, as they contribute to both the genetic line and the temperament of the offspring.”
Mare Behavior and Characteristics
Mares exhibit distinct behavioral traits that set them apart from male horses, showcasing their intelligence, independence, and occasional sensitivity.
A notable feature of mares is their seasonal estrus (heat) cycle, which can influence their behavior, leading to increased restlessness, vocalization, and attention-seeking tendencies.
To manage these effects, some horse owners may resort to hormone treatments or other techniques to regulate their mare’s cycle when disruptive behavior arises.
Generally, mares are perceived as more independent and sometimes temperamental compared to geldings or stallions; however, they are capable of forming strong bonds with their owners and are often fiercely protective of their offspring.
Horse trainer Bob Baffert mentions that “mares, while sometimes more difficult to handle, can also be some of the most rewarding horses to train. Their intelligence and strong personalities make them exceptional partners in the right hands.”
For more information on managing a mare’s estrus cycle, check out our mare health guide.
For more on training and working with mares, see our horse training tips.

