Sexual maturity in horses typically occurs at around 12 to 18 months of age, but can vary depending on breed and individual developmental differences. In mares and stallions, first estrus or first impregnation can occur at around 12 to 18 months of age. It is important to note that true breeding maturity, at which a mare can successfully conceive, is not usually reached until around three years of age to ensure healthy physical and mental development.
