By: Dr Rosie Alcorn BVSc PG Cert VPS Cert AVP MRCVS
In recent years, more ex-racehorses have been finding second careers in the leisure and sport horse sectors. With this change in career comes a change in management, workload, and lifestyle - and with that, the need for a carefully adapted diet.
Racehorses are the elite athletes of the equestrian world. They are trained intensively, and their diets reflect this: high levels of concentrate feed, larger starch content, and limited turnout. Their management is highly structured, with strict exercise and feeding routines.
When they first come out of training, many Thoroughbreds struggle to maintain condition, become sharp or excitable, and often show signs of stress. Understanding the common pitfalls in feeding ex-racehorses is essential to support a smooth transition.
One of the most common mistakes in retraining racehorses is changing their diet, routine, and management too quickly. Sudden alterations can be stressful and may worsen issues such as gastric ulcers.
While it may be tempting to assume a newly retired Thoroughbred will thrive on 24/7 turnout or gentle hacking, this is often a major shift from what they are used to. A gradual increase in turnout allows the digestive system to adapt to a forage-based diet while also giving the horse time to adjust mentally to its new lifestyle.
Ex-racehorses are also used to being stabled in busy training yards, so companionship remains important. Isolation can lead to stress and behavioural problems.
Another key pitfall in feeding ex-racehorses is switching directly from a racing diet to a leisure or sport horse feed overnight. The equine gut microbiome requires time to adapt, and sudden changes may cause digestive upset.
Racehorses are accustomed to high-energy, starch-rich diets fed in large quantities. As they transition to a different workload, these feeds should be gradually replaced with fat- and fibre-based energy sources, which are more suitable and sustainable for lighter work.
Ultimately, a fibre- and oil-based diet provides consistent energy without the excitability often associated with starch. However, the change must be carefully phased to protect gut health and ensure proper adaptation.
Keyflow's Sensi-Care is a high fibre, low starch soothing muesli which is perfect for stressy or nervy types as well as ulcer prone horses. As well as that, Sensi-Care is also high in oil and quality proteins - perfect for building condition, muscle and topline.
Feeding an ex-racehorse a diet still too high in starch, without the demands of race training, often results in sharpness or excitable behaviour. Instead, aim for:
A forage-based diet as the foundation.
Controlled amounts of low-starch concentrate.
Additional fat sources, such as vegetable oil or rice bran, to support condition without creating excess energy.
This approach ensures your Thoroughbred receives the right balance of calories and nutrients without compromising temperament.
When retraining and feeding an ex-racehorse, it is important to be aware of common health concerns:
Gastric ulcers – These are highly prevalent in Thoroughbreds, and the stress of leaving training can worsen symptoms. Always discuss ulcer prevention and treatment with your vet.
Dental problems – Thoroughbreds are prone to dental issues, which can affect condition and feed efficiency. Schedule regular dental checks.
Hoof quality – Thoroughbreds often have weaker feet, which can be difficult to manage. Work closely with your farrier and support healthy hoof growth through a balanced diet with appropriate supplementation.
Feeding and managing a retired racehorse requires patience and careful planning. Avoiding sudden changes, choosing appropriate energy sources, and addressing health considerations will help ensure your Thoroughbred transitions successfully into its new career.
If you need professional advice on feeding ex-racehorses, please contact our team for tailored support.
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