Can anyone tell me about hindgut acidosis in horses?

The millions of bacteria in the hindgut have adapted naturally to fermenting roughage or fibre. When undigested grain passes through into the hindgut, it undergoes fermentation with the production of lactic-acid. The resultant fall in pH leads to a change in the bacterial population. As some bacteria die they release toxins which are absorbed through the gut wall into the bloodstream where they are carried around the body . In the feet, they are able to shut down the blood supply to the hoof laminae, causing laminitis.

Hindgut acidosis usually occurs in horses that regularly eat excessive amounts of grain in one feed and also in horses grazing spring and autumn pastures high in fructans. Horses and ponies lack the enzyme necessary to digest these soluble carbohydrates, consequently they end being fermented in the hindgut

Check out the University Of Kentucky they have an awesome Equine Site.