Fig. 1. Relationship between whole-plant (a) dry matter yield, (b) crude protein (CP) concentration, (c) neutral detergent fiber (NDF) concentration, (d) acid detergent fiber (ADF) concentration, (e) in vitro true digestibility (IVTD) concentration, and (f) cell wall digestibility (CWD) concentration and (g) milk per megagram and (h) milk per hectare on growing degree units (GDUs). Data are reported for unfermented forage (—) and silage ( - - -). Each data point is the mean across four hybrids, four replicates, and 2 yr. Equations and coefficients of determination (R²) for Fig. 1 are reported in Table 3. R1 refers to the growth stage of corn when silks were emerged on at least 50% of the plants.

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