Grazing of barley as green forage is a common practice in the Mediterranean area due to its active growth along autumn and winter, and its ability to recover after a mild grazing (Bonachela et al., 1995). However, grain production at harvest might be affected depending on the intensity of defoliation suffered by the plant (Yau, 2003). Those studies were carried out mainly by hand clipping or allowing only a few hours of grazing per day. Hence, the objective of this experiment was to establish the relationship between grazing intensity and grain production at harvest when animals are kept in the paddocks for the whole day. Moreover, the ability of barley height and/or residual biomass after grazing (kg dry matter/ha) to predict final grain production was also tested.