Fig. 1. Linear regressions of mean neutral detergent fiber (NDF) concentration on selection cycle for four smooth bromegrass populations divergently selected for NDF. Regressions statistics for Alpha, WB19e, Lincoln, and WB88S, respectively, were b = 7.2 ± 1.5, 7.0 ± 2.1, 6.6 ± 1.6, and 8.6 ± 1.4 g kg^–1 cycle^–1; R² = 0.83, 0.79, 0.91, and 0.88.