This clip about Grass Sickness is part of The Moredun Foundation Centenary Film.

Grass Sickness, a devastating disease first seen in horses in Angus, Scotland around 1907, remains one of the great unsolved mysteries, and consequently one of the most feared by horse owners.

The impetus for research into Grass Sickness began in the early 1920s when huge losses in horses were recorded. Over the years 1923–1949, research at the Animal Diseases Research Association (the precursor to the Moredun Research Institute) included a great deal of investigation of potential causes and many were eliminated.

However, Grass Sickness remains a major cause of mortality in horses and ponies in Britain, with more than 95% of cases proving fatal.

The Moredun Foundation Equine Grass Sickness Fund (EGSF) is the only registered charity in the UK raising funds specifically for research into grass sickness.