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Changes in Nutritive Value of Bermudagrass Hay during Storage

Dep. of Animal Sci., Univ. of Arkansas, Fayetteville, AR 72701

View larger version (12K): [in a new window]   Fig. 1. Internal bale temperature during the initial 25 d of bale storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line], 265 [medium moisture (MM); dashed line], and 219 [low moisture (LM); solid light line] g kg-1.

View larger version (13K): [in a new window]   Fig. 2. Nonlinear regressions of concentrations of neutral detergent fiber (NDF) on time in storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line, squares], 265 [medium moisture (MM); dashed line, diamonds], and 219 [low moisture (LM); solid light line, circles] g kg-1. Regression equations for HM [Y = 777 - 93.1e-0.021t2; r2 = 0.97; root mean square error (RMSE) = 9.4], MM (Y = 757 - 69.5e-0.026t2; r2 = 0.91; RMSE = 12.1), and LM (Y = 739 - 67.8e-0.017t2; r2 = 0.96; RMSE = 7.3).

View larger version (10K): [in a new window]   Fig. 3. Nonlinear regressions of concentrations of acid detergent fiber (ADF) on time in storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line, squares], 265 [medium moisture (MM); dashed line, diamonds], and 219 [low moisture (LM); solid light line, circles] g kg-1. Regression equations for HM [Y = 391 - 61.3e-0.022t2; r2 = 0.93; root mean square error (RMSE) = 9.5], MM (Y = 368 - 40.1e-0.031t2; r2 = 0.85; RMSE = 9.2), and LM (Y = 363 - 33.0e-0.018t2; r2 = 0.99; RMSE = 1.4).

View larger version (12K): [in a new window]   Fig. 4. Nonlinear regressions of concentrations of lignin on time in storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line, squares], 265 [medium moisture (MM); dashed line, diamonds], and 219 [low moisture (LM); solid light line, circles] g kg-1. Regression equations for HM [Y = 65.4 - 16.8e-0.038t2; r2 = 0.90; root mean square error (RMSE) = 3.0], MM (Y = 58.1 - 12.6e-0.032t2; r2 = 0.83; RMSE = 3.1), and LM (Y = 62.1 - 14.5e-0.010t2; r2 = 0.86; RMSE = 3.2).

View larger version (10K): [in a new window]   Fig. 5. Nonlinear regressions of concentrations of neutral detergent–insoluble N (NDIN; g kg-1) on time in storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line, squares], 265 [medium moisture (MM); dashed line, diamonds], and 219 [low moisture (LM); solid light line, circles] g kg-1. Regression equations for HM [Y = 14.3 - 4.0e-0.009t2; r2 = 0.80; root mean square error (RMSE) = 1.1], MM (Y = 12.9 - 3.2e-0.030t2; r2 = 0.86; RMSE = 0.7), and LM (Y = 12.0 - 2.3e-0.014t2; r2 = 0.99; RMSE = 0.2).

View larger version (11K): [in a new window]   Fig. 6. Nonlinear regressions of concentrations of acid detergent–insoluble N (ADIN; g kg-1) on time in storage for bermudagrass hay baled at moisture concentrations of 302 [high moisture (HM); solid bold line, squares], 265 [medium moisture (MM); dashed line, diamonds], and 219 [low moisture (LM); solid light line, circles] g kg-1. Regression equations for HM [Y = 3.17 - 1.97e-0.020t2; r2 = 0.91; root mean square error (RMSE) = 0.35], MM (Y = 1.83 - 0.85e-0.031t2; r2 = 0.71; RMSE = 0.29), and LM (Y = 1.71 - 0.54e-0.021t2; r2 = 0.86; RMSE = 0.12).