What is a Mare in Horse Terms?

Mares are female horses. These mares possess nipples under their bellies that allow them to mate and give birth to foals (baby horses).

Mares typically enter heat every 21 days from early spring onward, usually carrying their foal for 11 months before giving birth to it. Most mares only give birth once every 21 days.


Fillies are young female horses. Most commonly, people use this term to refer to horses under four years old; however, sometimes experts use this terminology when discussing mares that have yet to give birth – an easy way of distinguishing age and gender when talking with other horse experts.

Fillies can become dams after reaching their fourth birthday and when this occurs they will give birth, marking the start of her breeding career. Most breeders prefer waiting until a filly is at least four before breeding her themselves.

Some people use the term “broodmare” as an all-encompassing term to refer to any adult mare, while a broodmare is defined as any female horse dedicated solely to breeding. She will likely not participate in racing or other activities anymore – perhaps an injured horse is turned into one! – but people might also choose this path when their horse no longer competes as effectively in competitions or due to injury or sickness.

People often refer to mares that have had an immense influence over multiple generations as “blue hens”, often treated with great respect by herd members and considered a key member. A blue hen may often become very dominant within her herd and be looked up to by its other members as an influential force within the herd.


Stallions, or male horses who haven’t been castrated, are referred to as stallions. Typically larger than female horses and with more of a cresty neck than their counterparts, they’re used for breeding purposes and sometimes known as sires when their offspring has foaled from one. Stallions may become aggressive towards other males or humans and sometimes attempt to herd mares within their herds into submission, often becoming dangerously unpredictable when it comes time for breeding season if sires have fathered foals from one another’s foal from another stalllion’s fathering efforts have resulted in foals being born out from one stallion being produced. Stallions also often become difficult or scary when handling so therefore not recommended as rides due to being difficult in managing and handling difficulties!

Contrary to popular belief, stallions do not live together in herds like mares and fillies do; rather they form groups consisting solely of male stallions for competition for mares. Stallions often display courtship behavior such as strutting and vocalizations to attract mares when in season – usually leading them into accepting them and becoming pregnant following mating with one.

A mare will carry her foal (baby horse) for approximately eleven months before giving birth, creating an incredibly close and intimate bond between mother and foal. Due to their strength, health, and long gestation periods, many owners use mares for breeding.

A blaze is a large white vertical marking found on Thoroughbred horses’ faces that is distinct and often highly visible. Other breeds also often possess similar markings on their foreheads; however, these might not be as large or distinguishing.

Boss Mare

A lead mare or boss mare is an essential member of any herd. Just as male stallions play an essential role in protecting their herd from outside threats by fathering new foals each season and fathering new foals each season themselves, a boss mare plays similar roles. She guides members towards food and water sources while overseeing movement patterns and daily schedules within their group – should another horse try to challenge her leadership, she will respond by pincer-backing its ears or biting or kicking back.

That is why it is crucial for horse owners to understand herd dynamics and the signals used within a herd. Horses communicate among themselves using various sounds such as blowing (a loud whooshing sound) and snorting (a shorter lower-pitched version of blowing). Mutual grooming – when two horses nibble each other’s coats as a sign of friendship and trust – also works well.

Mares play an indispensable role in racing and other equestrian activities beyond reproduction. While most races allow both stallions and fillies to compete, classic horse races usually favor mares because their bodies can better handle carrying heavier loads than stallion counterparts.


Domesticated or wild foals rely heavily on their mother’s milk for survival; it provides protection from disease while providing essential nutrition to sustain growth and development. Unfortunately, complications during foaling may prevent access to mother’s milk; in such instances veterinarians and many farms keep frozen mare’s colostrum ready to be fed to newborn foals immediately post birth.

Contrary to what may be thought, horse’s milk contains an exceptionally high proportion of protein as well as being packed full of fats and minerals – such as calcium and phosphorus as well as vitamins (particularly B-vitamins), amino acids, and organic trace elements.

Once a mare begins lactation, her teats become larger and her udder appears fuller. Colostrum may have an odd brown color; as soon as that has run its course her milk changes into classic white milk.

Mares can produce up to 15 liters of milk daily during their peak productivity phase, usually 30-60 days post foaling. She may continue lactating up to four years post-foaling; though production tends to decline with age. If she fails to produce sufficient milk production, this condition is known as mare anemia; treatment involves injecting her with additional iron or copper supplements and applying warm compresses directly over her vulvae.






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