The Beginner’s Guide to the Equine Digestive System

Intestines and the Hindgut 

Like the stomach, food also travels rather quickly through almost 70 feet of intestine, and this is the site where most carbohydrates and proteins are absorbed by enzymes. After that long journey, food continues to the hindgut — this is where horses get their classification as “hindgut fermenters.” This area is home to a huge population of microbes and bacteria species, which are needed to break down remaining nutrients.  

Water and vitamins are heavily absorbed here, while fibre is broken down by the microbes, producing needed calories. If dehydrated, this is the likely area of the horses’ tract that is susceptible to impaction colic. 

The cecum houses all those microbes, whose populations vary depending on what the equine diet consists of. Ideally, most non-structural carbohydrates (NSCs) will be absorbed in the foregut by enzymes, leaving fibrous materials to be digested here by microbes for hours. The goal is to make sure the microbial population is happy and flourishing. This is achieved by ensuring that horses always have a healthy intake of fibrous material in their diet. 

Keeping an eye on your horses’ poop balls is a good indication of their overall health since this is the end of the journey. Diarrhea is usually the result of undigested food or quick feed changes. On the other hand, if you notice your horses’ poop balls are very dry, you should increase their water intake by providing loose salt in their diet to prevent potential blockages. 

The equine digestive tract is fascinating, unique, and full of twists and turns (literally), so it’s important that we feed to our horses’ needs. Although modern horses live a much different life than their ancestors did, their digestive process is very much the same. We want to be cognizant of their natural process, while also providing the nutritional requirements for the active horse of today. 

Long-stem forage is the foundation diet for a healthy horse. Remember that saliva is needed to prevent ulcers, ensure safe feedstuff travels through the tract, and to keep the hindgut microbial population happy. For horses that have trouble chewing, such as seniors, a fibre replacement product must be included in the diet. 

Depending on individual needs, a ration balancer or complete feed for the working horse compliments a forage-based diet. Smaller and more frequent meals are best practice. Most horses require extra calories and nutrients in order to perform, so being able to provide two or three smaller concentrated meals will optimize the absorption of vitamins and minerals while also making sure most NSCs are absorbed before reaching the hindgut. 

Creating a happy, healthy horse means providing a feed plan that caters to both their evolutionary instincts as well as their specialized modern needs in sport and recreation.