Plant breeders are developing perennial ryegrass (PRG) varieties with elevated water soluble carbohydrate (WSC) contents as these have been shown to enhance ruminant production (Lee et al., 1999). However, it would seem wise to limit the intake of WSC by horses, as ingestion of high levels of WSC by horses has been associated with the onset of metabolic disorders such as colic and laminitis (Hinkley, 1997). It is not known whether the genetic potential of PRG to accumulate high levels of WSC is expressed under all conditions, and if WSC levels can be controlled through management. In this study the effect of frequency of cutting regime on WSC accumulation and dry matter (DM) yield of a high WSC accumulating PRG variety, AberDart was compared with a control variety, Fennema.