Fig. 7. Sulla organic matter digestibility (OMD) as a function of mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona (both cultivars) and (b) Sassari. Regression equations of the pooled data:

(a) OMD_{Ancona 96-97} (g kg^-1 OM) = -29.3MSW + 802 r² = 0.86 RMSE = 31 OMD_{Ancona 98} (g kg^-1 OM) = -38.9MSW + 811 r² = 0.82 RMSE = 34

(b) OMD_{Sassari 96-98} (g kg^-1 OM) = -36.7MSW + 746 r² = 0.76 RMSE = 39 OMD_{Sassari 97} (g kg^-1 OM) = -41.4MSW + 876 r² = 0.88 RMSE = 33