The wilting of grass prior to ensiling is an effective method of reducing the moisture content of the grass and improving the fermentation quality of the silage (Wilkinson et al., 1996). The effects of wilting grass on voluntary intake, digestibility and animal performance are variable, potentially reflecting the losses of nutrients from the crop during the wilting period. Three methods of swath treatment to accelerate the loss of water from the mown crop are currently used in northern Europe, wilting in the swath, spreading the crop to 1.0 of ground area and tedding swaths. The aim of the experiment reported here was to investigate the effect of swath treatment and duration of field wilting on the voluntary intake and digestibility of wilted silage offered to lambs.