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Horse
owners are very familiar with hoof trimmings: they are a routine by-product of
farriery visits and are usually
swept up and discarded without much thought, if not eaten by the dog first. However, recent
scientific research suggests that these small clippings may have much greater
value than previously realised. A growing body of work in materials chemistry and biopolymer
engineering is
exploring how horse hoof trimmings could become a sustainable and useful
natural resource.
At the centre of this research is keratin, a tough structural protein that gives strength and resilience to materials such as hair, wool, feathers, and hooves. Keratin is well known for its excellent mechanical properties (it is strong and durable) and biochemical stability (it resists breakdown). Because of these qualities, keratin has potential uses in a wide range of applications, from biodegradable plastics to medical materials.
Currently, most keratin-rich waste, such as poultry feathers, sheep wool, and animal hooves, is either burned (incinerated) or sent to landfill. This creates environmental problems, including greenhouse gas emissions and the loss of potentially valuable biological resources. In contrast, horse hoof trimmings represent an underused and more sustainable alternative.
One of the key advantages of hoof trimmings is that they are produced regularly as part of routine horse care. Every time a farrier trims a horse’s hooves, keratin-rich material is removed to maintain hoof health and balance. This means hoof trimmings are a renewable resource that does not require additional harvesting or harm to the animal. Unlike keratin sources obtained from slaughtered animals, hoof trimmings are also considered cruelty-free, which may be important for ethical and consumer reasons.
From a scientific perspective, hoof keratin is a high-quality material. Studies have shown that its chemical composition and structure are similar to other keratin sources, but with some unique features. The properties of hoof keratin can vary depending on factors such as the horse’s nutrition, living environment, and management practices. For example, diet influences the availability of amino acids needed for keratin production, while environmental conditions such as moisture can affect hoof quality. This means that hoof trimmings could even provide indirect information about horse health and management.
Researchers are now investigating how to extract keratin from hoof trimmings using more environmentally friendly (“green”) methods. Traditional extraction techniques often involve harsh chemicals or high energy use, which reduces sustainability. Newer approaches aim to minimise environmental impact while still producing high-quality keratin. These include using mild chemical treatments, enzymes, or recyclable solvents.
Once extracted, keratin can be upcycled, that is, transformed into higher-value products. Potential applications include:
- Biodegradable packaging materials
- Fertilisers or soil conditioners
- Medical products such as wound dressings
- Fibres for textiles or composites
These innovations are closely linked to the idea of circular economy, where waste materials are reused and repurposed instead of discarded. By turning hoof trimmings into useful products, researchers hope to reduce waste and make better use of natural resources.
However, there are still challenges to overcome. Collecting and processing hoof trimmings on a large scale may be difficult, as they are currently dispersed across many small yards and farriers. In addition, more research is needed to optimise extraction methods and ensure that keratin-based products are safe, cost-effective, and competitive with existing materials.
In summary, horse hoof trimmings are no longer just waste, they are an emerging example of how everyday equine practices can connect to wider issues such as sustainability, innovation, and environmental responsibility.
For more details, see:
Esther Trigueros, Sara Mattiello, Lisa Rita Magnaghi, Carlo Santulli, Raffaela Biesuz,
Horse Hoof Trimmings as an Untapped Resource for Sustainable Keratin Utilization
ChemistryOpen2026, 15, e202500575.
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