What is the Female Horse Called a Filly?

Fillies, female horses that have not reached four years old, typically do not produce fertile offspring until they mature into mares.

Mares go into heat or season every 21 days starting in spring, sometimes carrying twin foals as well. You can easily identify female horses by their penis and vulva being visible.


Horses have long been an integral part of human culture and society for millennia, so it comes as no surprise that humans have developed numerous terms to categorize and describe them. A common one is “mare.” A mare refers to an adult female horse which has been bred specifically to produce foals or milk. Mares tend to be more submissive than their stallion counterparts and respond well to training; moreover they tend to bond more readily with one rider/owner/rider pair than male counterparts do.

Adult mares can usually be easily identified from a distance because they lack male parts below their belly region. When lifting up a mare’s tail, two genital openings – anus and vulva – will become visible. When in heat cycle mares may become highly hormonal and be unpredictable in behavior – making them nervous, spooky and difficult to manage.

Younger mares are commonly referred to as fillies and can sometimes be difficult to distinguish from male horses. A filly refers to any young female horse up to four years of age that has not yet been bred or given birth; before being considered a filly she may be known by other names such as yearling or weanling; once bred they are often known by this title too – such as broodmare.


Fillies are young female horses not yet mares that can be trained as horses that can be ridden. When born, foals or weanlings become foals or yearlings as they grow into fillies that can then begin training programs to make them rideable horses – fillies being easier than their male counterparts due to reduced testosterone production.

Young fillies can develop quickly if fed properly. To achieve this goal, provide her with high-quality hay that contains at least 10% protein; this will enable her to build muscle quickly while deworming and vaccination are carried out regularly. A vet or horse professional will also be able to develop a feeding plan specifically tailored for your filly.

Once a filly turns four years old, she is considered a mare and may be used either for breeding purposes or racing – there are even races specifically reserved for mares and fillies in racing!

If you’re having difficulty telling whether a horse is a filly or stallion, use its ears to determine gender. Stallions and geldings have more defined ear shapes while fillies have soft corners and edges. Also look out for signs of pregnancy; when pregnant mares are large with full bellies that show their udders.


Horses are herd animals and have an instinctual desire to establish order in their group, hence why stallions tend to be more aggressive than mares. Trained stallions require time, skill, and dedication if they exhibit bad behaviors – failing which they may become dangerous.

Wild herds dominated by dominant stallions typically break into smaller herds to reduce competition for mares and allow the herd to have more foals. Stallions are also commonly used as working horses and in sports; typically they possess greater strength and athleticism compared to mares.

Stallions, male horses with fully functional reproductive organs, are known as stallions when their secondary sexual characteristics include thicker necks and muscular builds. Testosterone plays an integral part in creating their masculine look allowing them to breed offspring successfully.

During breeding season, stallions often mark their territory by marking with urine – an instinctive way of communicating with other horses as well as signalling that they are available for mating. Males also tend to poop in the same spot often leaving behind small piles where they stand. This behavior known as elimination marking makes mucking time much simpler!


A dam is the mother of a horse. A female thoroughbred that gives birth is known as a mare or broodmare, making them essential terms to know as a beginner; these terms will allow you to understand more easily the world of horses while engaging with other enthusiasts more confidently.

Stallions, male horses that have not been castrated, are used for breeding purposes and considered studs. A castrated stallion is known as a gelding; such a horse cannot reproduce.

Female horses have various names depending on their age and breeding status. A filly refers to young female horses aged two years or younger; she may become a mare after four years old. Broodmares produce female foals specifically for breeding purposes while dams give birth and remain mature female horses after giving birth.

Foals, or baby horses still dependent upon their mothers for sustenance, can begin life suckling from them as early as three months old. Once weaned from its mother, this animal becomes known as a weanling. Once transitioned away from suckling diet to more traditional one diet a yearling horse has entered maturity and may eventually become sire after one of his offspring wins a race at an established track.






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