Does a horse go into heat every month?

No, horses do not go into heat every month. They are seasonal breeders, meaning they only cycle and are receptive to breeding during certain times of the year.

Here's a breakdown:

* Mare's Estrous Cycle: A mare's estrous cycle, which includes heat or ovulation, typically lasts around 21 days.

* Seasonal Breeding: Most mares come into heat during the spring and summer months when the days are longer and there's more daylight. This is because their cycle is influenced by changes in the length of daylight.

* Variations: Some breeds of horses, like the Thoroughbred, may be more prone to cycling year-round, while others may have shorter or longer breeding seasons.

So, while a mare's cycle lasts about 21 days, she will only be receptive to breeding during specific times of the year, not every month.