The seasonal coat change in horses is far more than just shedding a few hairs — it’s a complex, whole-body transformation. Twice a year, in spring and autumn, your horse’s body adapts to changing temperatures and light conditions. This natural process places extra demands on the immune system, metabolism, and nutrient supply.
In this guide, we’ll explore what’s happening inside your horse during coat change, how you can support them naturally, and which nutrients and routines make a real difference — with a special focus on Thunderbrook’s gentle, nature-rooted approach to equine nutrition.
What Happens During Coat Change?
A Natural, Hormone-Driven Process
Coat change is triggered by daylight length, which influences your horse’s hormone balance via the pineal gland. As the new coat grows, the old one sheds — a process that places significant strain on the immune system and metabolism. Nutrient requirements rise sharply during this time.
Why Spring and Autumn Are Especially Demanding
In spring, the thick winter coat gives way to a lighter summer coat, while in autumn, a dense layer grows to protect against cold and damp. These transitions increase the need for:
- Amino acids (especially sulphur-containing ones like methionine and cysteine)
- Trace elements (zinc, copper, selenium)
- Vitamins (A, E, B-complex)
- Omega-3 fatty acids
Older horses, those recovering from illness, or horses with metabolic conditions such as Cushing’s may need extra support. Thunderbrook CushinEase is specially formulated to help support horses prone to Cushing’s during these demanding phases.
How Long Does Coat Change Last?
Typically, coat change takes 4–6 weeks, depending on age, health, environment, and nutrition. With the right support, this process can be smooth and stress-free.
Common Challenges During Coat Change
Tiredness, Reduced Performance & Skin Issues
Many horses appear more lethargic, sweat more easily, or develop dull coats and flaky skin. This isn’t laziness — it’s a sign of increased nutrient demand and oxidative stress. Support your horse with:
- High-quality forage
- Targeted micronutrient supplementation
- Gentle exercise and rest balance
Itching and Rubbing
Loose hairs and active sebaceous glands can irritate the skin. Regular grooming, soft brushes, and massage gloves help stimulate circulation and reduce itchiness. Ensure rugs and tack fit well and don’t rub.
Feeding for a Healthy Coat Change
Key Nutrients for Coat Health
To support a shiny, resilient coat, your horse needs:
- Protein, especially sulphur-rich amino acids for keratin production
- Zinc, copper, selenium for skin, hair, and immune function
- Vitamins A, E, C, and B-complex for cell protection and metabolism
- Omega-3 fatty acids, such as those found in Thunderbrook Micronized Linseed Plus and Ahiflower® Oil, for skin barrier support and anti-inflammatory balance
Forage First – The Foundation of Natural Nutrition
A dust-free, hygienic hay with good nutrient content is essential. It supports digestion, skin health, and overall vitality. During coat change, a slight increase in protein may be beneficial — but avoid overfeeding concentrates, which can burden the metabolism.
Ensure your horse has constant access to fresh water. In warmer weather or during training, consider adding electrolytes to maintain hydration and mineral balance.
Spotlight on Trace Elements
Zinc – For Skin & Hair Growth
Zinc supports cell division, wound healing, and keratin formation. Deficiency signs include dull coat, dandruff, and delayed shedding. Always choose bioavailable forms.
Copper – For Pigmentation & Collagen
Copper aids melanin production and skin elasticity. A lack may show as faded coat colour or brittle hair. Zinc and copper must be balanced — excess zinc can reduce copper absorption.
Selenium – For Antioxidant Protection
Selenium supports muscle and immune function. During coat change, oxidative stress increases, making selenium (especially in combination with vitamin E) vital. Follow feeding guidelines carefully, as selenium has a narrow safety margin.
Sulphur-Containing Amino Acids
Methionine and cysteine are key building blocks for skin, coat, and hooves. Adequate supply via forage and supplements helps maintain coat quality and growth.
Vitamins for a Healthy Coat
- Vitamin A: Supports skin and mucous membranes. Usually covered by good forage, but supplementation may help when grass intake is low.
- Vitamin E: A powerful antioxidant that protects cells and muscles. Works synergistically with selenium.
- Vitamin C: Horses produce it naturally, but older or stressed horses may benefit from a short-term boost.
- B-Vitamins: Essential for energy and protein metabolism. Biotin, often linked to hoof health, also supports skin and coat.
Omega Oils & Coat Shine
Omega-3 fatty acids are vital for skin health and coat shine. Thunderbrook Micronized Linseed Plus offers a gentle, natural source — rich in omega-3s, amino acids, and mucilage to support digestion.
For a concentrated, plant-based omega boost, Thunderbrook Ahiflower Oil is a unique alternative to flax or fish oils. It’s naturally anti-inflammatory and supports skin, joints, and immune balance.
Supporting Digestion During Coat Change
A healthy gut is key to nutrient absorption. Thunderbrook Gut Restore helps stabilise the gut flora, improve feed utilisation, and support coat change — especially in sensitive horses, seniors, or those recovering from stress.
Practical Tips for Everyday Coat Care
- Groom regularly to remove loose hairs and stimulate circulation.
- Use pH-balanced shampoos sparingly to protect the skin’s natural oils.
- Encourage gentle movement to boost blood flow and metabolism.
- Provide turnout time for natural light and exercise.
- Maintain clean rugs, good ventilation, and dust-free bedding.
- Monitor weight — excess body fat can strain the metabolism.
Frequently Asked Questions
Why Does My Horse Shed in Winter?
Even outside peak shedding seasons, coat renewal continues. Mild winters, heated stables, or early spring weather can trigger shedding due to light and temperature changes.
Why Are There Bald Patches?
Circular bald spots may indicate fungal infections or parasites. Pressure points from rugs or tack can also cause hair loss. Nutrient gaps (especially zinc and copper) may contribute. Always consult your vet for unclear or inflamed skin issues.
What Stimulates Coat Growth?
Light, movement, balanced nutrition, and consistent care. Key nutrients include zinc, copper, selenium, biotin, and omega-3s — ideally from natural sources like Micronized Linseed Plus and a full-spectrum mineral feed.
Conclusion – Helping Your Horse Through Coat Change Naturally
Summary of Key Tips
- Foundation: High-quality forage, balanced mineral feed, and tailored concentrates.
- Nutrients: Zinc, copper, selenium, biotin, vitamins A, E, C, and omega-3s.
- Care: Grooming, exercise, clean environment, and weight management.
Focus on Natural Feeding & Gentle Care
With thoughtful feeding and consistent care, your horse can transition smoothly through coat change. A healthy digestive system, supported by Gut Restore, ensures nutrients reach where they’re needed. And with Micronized Linseed Plus, you’re giving your horse nature’s best for a glossy coat and resilient skin.