Fig. 5. Protein concentration in available herbage over the 1995 and 1997 growing season as a function of defoliation frequency. Vertical bars are standard error of the mean. 2WK, clipped at 2-wk intervals to a 5-cm residue; S50, 10-cm canopy clipped to 5-cm residue; T75, 20-cm canopy clipped to a 5-cm residue; 6WK, clipped at 6-wk intervals to a 5-cm residue.