The biggest reason not to would be because, assuming you are in the northern hemisphere, according to every breed association I can think of at the moment, your colt would become a yearling at less than 3 months old. It also can be hard to get mares to cycle. But if you arenít planning on having a race or show colt and your mare is happily cycling, and they have a warm safe place to stay until spring but will still be able to get some exercise you could probably do it. If you try to sell that colt when it is any younger than 5 years old, you might have trouble selling it because it wonít be as mature as other colts born the same year. Unless you have a really good reason to breed in November, just wait until next year.
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