At what age does a colt become a stallion?
How old is a colt or filly?
COLT A young male horse that has not been gelded (neutered).For Thoroughbred, a colt is under four years of age, in most other breeds and contexts, a colt is under three years of age. Sometimes used incorrectly to refer to any young horse. FILLY A young female horse.
How long is a horse a filly?
Definition of Filly
A female horse under four years of age is called a filly. A female horse over the age of four years is called a mare.
How old are mares when they stop breeding?
If the mare is healthy, usually it is quite safe to breed her up to about 15-16, though I have seen mares conceive for their first up to about 18 years old.