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Horse Breeding – The Mare

Business and Management

Horse Breeding – The Mare

The hormones that control a horse's reproductive cycle are like a waterfall. They are produced in the horse's brain and flow through the horse's body to the reproductive organs.

This is called the cascade effect. In this report, we will try to help you to understand this waterfall phenomenon: what happens in your mare and how you can plan your mating season. You can browse if you're looking for horse supplements.

Mares cycle many times during the breeding season; this is called polyoestrous. One cycle, on average, 21 days.

In cycles, there is one fertile phase when horses are considered 'in season'. This usually lasts about 5 days but varies greatly from horse to horse. Fillies will usually start cycling from around the next 12 months.

Years of horse reproduction can be divided into three phases:

1. Cycling Phase – when the mare is cycling (each cycle is moderate, on average, 21 days) including a fertile period of about 5 days.

2. Non-Cycling Phase – occurs in winter when most horses are not cycling and are infertile.

3. Transition – occurs twice a year, late fall and early spring. At this time, the mare can display unexpected or unusual behavior. He can also give an off-season appearance during this transition period, even though he doesn't.


The 21-day cycle of the mare was measured from ovulation to ovulation. The first day is the day ovulation occurs. This cycle can be divided into two phases:

1. The estrous phase is a fertile period that lasts from the first day to about the 5th or 6th day. At that time the mare can receive stallions.

2. The dioestrus phase is an infertile cycle period. This phase lasts about 15 or 16 days.


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