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Divergent Selection for Two Measures of Intake Potential in Smooth Bromegrass

Dep. of Agronomy, Univ. of Wisconsin-Madison, Madison, WI 53706-1597

View larger version (17K): [in a new window]   Fig. 1. Direct responses of neutral detergent fiber (NDF) concentration to divergent selection for NDF in four smooth bromegrass populations. Means are over four replicates, three locations, 3 yr, and three harvests. Solid lines represent linear selection responses (b) and dashed lines represent effects of drift (d). R2 = 0.99, 0.73, 0.83, and 0.76 for Alpha, WB19e, Lincoln, and WB88S, respectively.

View larger version (17K): [in a new window]   Fig. 2. Indirect responses of particle size reduction index (PSRI) to divergent selection for neutral detergent fiber (NDF) concentration in four smooth bromegrass populations. Means are over four replicates, three locations, 3 yr, and two harvests. Solid lines represent linear selection responses (b) and dashed lines represent effects of drift (d). R2 = 0.99, 0.94, 0.97, and 0.99 for Alpha, WB19e, Lincoln, and WB88S, respectively.

View larger version (16K): [in a new window]   Fig. 3. Direct responses of particle size reduction index (PSRI) concentration to divergent selection for PSRI in four smooth bromegrass populations. Means are over four replicates, three locations, 3 yr, and two harvests. Solid lines represent linear selection responses (b) and dashed lines represent effects of drift (d). R2 = 0.91, 0.97, 0.99, and 0.99 for Alpha, WB19e, Lincoln, and WB88S, respectively.

View larger version (17K): [in a new window]   Fig. 4. Indirect responses of neutral detergent fiber (NDF) concentration to divergent selection for particle size reduction index (PSRI) in four smooth bromegrass populations. Means are over four replicates, three locations, 3 yr, and three harvests. Solid lines represent linear selection responses (b) and dashed lines represent effects of drift (d). R2 = 0.09, 0.54, 0.61, and 0.32 for Alpha, WB19e, Lincoln, and WB88S, respectively.