12/02/2026
There’s been a lot of hate lately about breeding mares every year, and as a breeder, I think it’s important to bring the conversation back to biology and responsible management.
 It’s fine to have a mare carry consecutive years. It’s fine to give them a break (which if any of you lunatics actually cared to learn something, mine have all had a year off when needed).
A mare’s average gestation is around 340 days but can be anywhere between 320 and 380. Horses evolved as seasonal breeders, meaning their reproductive cycles are timed with increasing daylight so foals arrive in spring and early summer.. though some mares will cycle year round.
In natural herd settings, when a mare is healthy and resources are available, she will often conceive again shortly after foaling. That isn’t something humans created, it’s part of how horses were designed to survive as a species.
One of the most common claims is that breeding yearly is “too hard” on a mare’s body. The truth is, a healthy mare in proper body condition, with appropriate nutrition and veterinary oversight, is physiologically built to carry and nurse a foal. It can actually cause fertility issues by leaving mares open as they were built to carry every year.
What is hard on a mare is poor management. Breeding underweight mares, breeding aged mares without evaluation, lack of veterinary care, or failing to meet increased nutritional demands. That’s mismanagement, not biology.
Some mares can carry into their mid 20’s and others are done in their late teens. You need to look at the individual horse.
Another argument is that mares “need” a year off to recover. Sometimes they do, and responsible breeders absolutely make that call when needed. Every mare is an individual. We assess body condition, uterine health, age, and overall wellbeing before making decisions. But it’s also important to understand that many mares naturally conceive on their foal heat. While I personally avoid breeding on the foal heat, mare’s bodies were made to heal remarkably fast and able to concieve within 7-10 days of foaling. Their bodies are designed for that rhythm.
At the end of the day, mares are not fragile creatures being “used” simply because they reproduce. Reproduction is a fundamental part of equine biology. Our role as breeders is to ensure that if a mare is bred, she is healthy, properly cared for, and supported every step of the way.
Welfare must always come first. But welfare decisions should be rooted in science, experience, and thoughtful management, not human emotion.
Healthy mares are incredibly resilient animals. Responsible breeding respects both their biology and their wellbeing. ❤️c
