Just like people, horses are sensitive to changes in their internal environment—especially when it comes to hormones. If you’ve noticed your mare becoming more reactive, anxious, or unsettled at certain times, her reproductive cycle may be playing a role.
Understanding what’s happening inside her body is the first step toward compassionate and holistic support.
What Is a Hormonal Mare?
A "hormonal mare" is a term often used to describe a mare displaying changes in behaviour due to hormonal fluctuations—particularly during her oestrus (heat) cycle. During this time, rising oestrogen levels can lead to noticeable shifts in mood, sensitivity, and physical comfort.
Some mares may show increased irritability or excitability. Others may seem more withdrawn or uncomfortable. While these changes are natural, they can sometimes become disruptive or distressing for both horse and owner.
Common Signs of Hormonal Imbalance in Mares
Not all mares will exhibit the same symptoms, and many move through their cycles with minimal disruption. However, here are some behaviours you might observe when hormones are affecting her balance:
- Increased sensitivity or aggression - Biting, kicking, or refusing handling, especially when approached by other horses.
- Heightened vocalisation - Frequent whinnying, squealing, or calling—often in response to nearby stallions or herd changes.
- Restlessness - Pacing, pawing, or difficulty standing still. She may toss her head or appear generally unsettled.
- Discomfort or cramping - Physical unease during oestrus can lead to irritability, reluctance to be touched, or poor performance under saddle.
These behaviours can sometimes be mistaken for training or behavioural issues, but they may simply reflect an internal hormonal struggle.
Other Contributing Factors
It’s important to remember that hormonal changes are only one part of the picture. Stress, poor gut health, pain, or underlying health conditions can also affect a mare’s behaviour. Sudden or extreme shifts in temperament should always be evaluated by a trusted equine vet or practitioner to rule out other causes.
How Herbs Can Help Balance Hormones and Calm the Nervous System
At McDowells Herbal, we believe that true healing begins with understanding and supporting the whole horse—mind, body, and spirit. Our approach is rooted in both traditional herbal wisdom and modern insights into equine health.
Herbs can offer gentle, non-invasive support by:
- Nourishing the endocrine system, which governs hormone production.
- Soothing the nervous system, helping your mare respond to her environment with more ease.
- Encouraging emotional balance, particularly during times of change or stress.
The McDowells Hormonal Mare Formula
Our Hormonal Mare Formula has been carefully developed using herbs traditionally used to restore hormonal harmony and calm flighty or fidgety behaviour. This blend supports the natural rhythms of your mare’s body and promotes a more comfortable, grounded temperament.
Key Ingredients:
Chaste Tree (Vitex agnus-castus): Supports normal pituitary and reproductive gland function.
Poke root (Phytolacca americana): Traditionally used for lymphatic, immune-modulating, and glandular-stimulating properties.
Buchu: Supports the urinary and reproductive systems.
Vervain & Passionflower: Calming nervines that reduce emotional tension.
Zizyphus: A gentle herb used to encourage deep relaxation and reduce nervous energy.
Bach Flower Essences: Including Cherry Plum, Heather, Holly, Mimulus, Rock Rose, Scleranthus, and Walnut—each offering emotional support and balancing reactive patterns.
This formula is designed not just to suppress symptoms, but to support your mare's whole system—encouraging long-term resilience and emotional equilibrium.
Hormonal shifts are natural, but they don’t have to be distressing. By understanding your mare’s needs and working with her body—not against it—you can create a calmer, more comfortable experience for both of you.
Every horse is unique. If you’re unsure where to begin or want personalised advice, we’re here to help.
We offer free consultations to help tailor a natural, holistic plan that supports your mare's individual needs—so you can enjoy a more connected, harmonious relationship.
