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Forage Nutritional Characteristics of Orchardgrass and Perennial Ryegrass at Five Irrigation Levels

USDA-ARS, Forage and Range Res. Lab., Utah State Univ., Logan, UT 84322-6300

View larger version (17K): [in a new window]   Fig. 1. Mean trends in crude protein (CP): (a) nine orchardgrass cultivars at five water levels (WLs) and three harvest dates (mid-June, July–August, late-September), (b) seven perennial ryegrass cultivars at five WLs and three harvest dates, (c) orchardgrass and perennial ryegrass (RG) across five WLs, and (d) diploid and tetraploid perennial ryegrass (PRG) across five WLs. Vertical bars indicate the standard error.

View larger version (17K): [in a new window]   Fig. 2. Mean trends in digestible neutral detergent fiber (dNDF): (a) nine orchardgrass cultivars at five water levels (WLs) and three harvest dates (mid-June, July–August, late-September), (b) seven perennial ryegrass cultivars at five WLs and three harvest dates, (c) orchardgrass and perennial ryegrass (RG) across five WLs, and (d) diploid and tetraploid perennial ryegrass (PRG) across five WLs. Vertical bars indicate the standard error.

View larger version (15K): [in a new window]   Fig. 3. Mean trends in in vitro true digestibility (IVTD): (a) nine orchardgrass cultivars at five water levels (WLs) and three harvest dates (mid-June, July–August, late-September), (b) seven perennial ryegrass cultivars at five WLs and three harvest dates, (c) orchardgrass and perennial ryegrass (RG) across five WLs, and (d) diploid and tetraploid perennial ryegrass (PRG) across five WLs. Vertical bars indicate the standard error.

View larger version (16K): [in a new window]   Fig. 4. Mean trends in neutral detergent fiber (NDF): (a) nine orchardgrass cultivars at five water levels (WLs) and three harvest dates (mid-June, July–August, late-September), (b) seven perennial ryegrass cultivars at five WLs and three harvest dates, (c) orchardgrass and perennial ryegrass (RG) across five WLs, and (d) diploid and tetraploid perennial ryegrass (PRG) across five WLs. Vertical bars indicate the standard error.