A horse’s gut is much more than just a digestive organ. It is a living ecosystem of billions of micro-organisms working together to keep your horse healthy, energetic, and in balance. Yet gut health is still often underestimated, until something goes wrong.

In this blog, we explain why a healthy gut flora is so crucial, what can disrupt it, and how you can support it.

What does the gut flora actually do?

The microbiome, the collection of all bacteria, fungi, and micro-organisms in the gut, performs a wide range of functions:

• Breaking down fibres that the horse cannot digest on its own
• Producing volatile fatty acids as an energy source
• Producing vitamins such as biotin and vitamin K
• Supporting and activating the immune system
• Protecting against pathogens

A healthy microbiome is characterised by great diversity. Disruptions in this balance, also known as dysbiosis, can lead to issues such as loose manure, a bloated abdomen, reduced immunity, or even behavioural changes.

The gut and behaviour: an underestimated connection

Did you know that more than 90% of the serotonin in the body is produced in the gut? Through the so-called gut-brain axis, the digestive system is in constant communication with the nervous system.

A horse with a disrupted microbiome may become more nervous, more difficult to ride, or react more tensely, not because it is difficult, but because its gut is not functioning properly. An unsettled gut creates an unsettled horse.

What disrupts the gut flora?

The most common causes are:

• Sudden feed changes: the gut flora needs 10 to 14 days to adapt
• Too much sugar or starch: feeds the wrong bacteria and lowers the pH
• Too little roughage: the beneficial bacteria starve
• Stress caused by transport, stable changes, or herd changes
• Seasonal transitions: especially spring grass (high fructan content) and the transition from pasture to hay in autumn

Long periods without roughage can also be problematic. A horse’s stomach continuously produces acid, even when it is empty. In addition, feeding large meals at once can place extra strain on the gut flora. Physiologically, horses are designed to consume small amounts of fibre-rich feed throughout the day.

How do you support a healthy gut flora?

The good news: the gut flora is resilient and responds quickly to the right approach.

• Ensure continuous access to fibre-rich roughage
• Choose feed low in sugar and starch
• Never change feed abruptly: transition gradually over 1–2 weeks
• Provide sufficient exercise: this stimulates gut function
• Introduce pasture turnout gradually in spring

Sufficient exercise supports gut function. Even calm walking helps stimulate gut motility.

A healthy gut is not built in a week. It is the result of consistent choices in feeding and management, day after day.

Do you have questions about your horse’s gut health? We are happy to help you think along.

Want to learn more? Contact us!