<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> A mare is an adult female horse or other equine . </P> <P> 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 years old . The word can also be used for other female equine animals, particularly mules and zebras, but a female donkey is usually called a "jenny". A broodmare is a mare used for breeding . A horse's female parent is known as its dame . </P> <P> An uncastrated adult male horse is called a stallion and a castrated male is a gelding . Occasionally, the term "horse" is used to designate only a male horse . </P>

When does a horse change from a filly to a mare
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