Fillies
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A filly is a female horse that is too young to be called a
mare A mare is an adult female horse or other equine. In most cases, a mare is a female horse over the age of three, and a filly is a female horse three and younger. In Thoroughbred horse racing, a mare is defined as a female horse more than four ...
. There are two specific definitions in use: *In most cases, a ''filly'' is a female horse under four years old. *In some nations, such as the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
and the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
, the world of
horse racing Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys (or sometimes driven without riders) over a set distance for competition. It is one of the most ancient of all sports, as its basic p ...
sets the cutoff age for fillies as five. Fillies are
sexually mature Sexual maturity is the capability of an organism to reproduce. In humans it might be considered synonymous with adulthood, but here puberty is the name for the process of biological sexual maturation, while adulthood is based on cultural definiti ...
by two and are sometimes bred at that age, but generally, they should not be bred until they themselves have stopped growing, usually by four or five.Ensminger, M. E. ''Horses and Horsemanship: Animal Agriculture Series.'' Sixth Edition. Interstate Publishers, 1990. p. 149-150 Some fillies may exhibit
estrus The estrous cycle (, originally ) is the set of recurring physiological changes that are induced by reproductive hormones in most mammalian therian females. Estrous cycles start after sexual maturity in females and are interrupted by anestrous p ...
as yearlings. The equivalent term for a male is a
colt Colt(s) or COLT may refer to: *Colt (horse), an intact (uncastrated) male horse under four years of age People * Colt (given name) *Colt (surname) Places *Colt, Arkansas, United States *Colt, Louisiana, an unincorporated community, United States ...
. When horses of either sex are less than one year, they are referred to as
foal A foal is an equine up to one year old; this term is used mainly for horses, but can be used for donkeys. More specific terms are colt for a male foal and filly for a female foal, and are used until the horse is three or four. When the foal i ...
s. Horses of either sex between one and two years old may be called yearlings.


See also

*
Filly Triple Crown The Triple Tiara of Thoroughbred Racing, formerly known as the Filly Triple Crown, is a set of three horse races in the United States which is open to three-year-old fillies. Presently the only official Triple Tiara is the three race series in New Y ...
*
Weanling A weanling is an animal that has just been weaned. The term is usually used to refer to a type of young horse, a foal that has been weaned, usually between six months and a year. Once it is a year old, the horse is referred to as a yearling. The ...


References

{{Reflist Types of horse Female horses