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- W2128063973 abstract "Nutrient composition and in situ dry matter (DM) and neutral detergent fiber (NDF) degradation of bermudagrass [Cynodon dactylon (L) Pers.] may vary with different management and environmental factors. This study evaluated nutritional value and in situ degradation characteristics of DM and NDF for bermudagrass, a perennial, warm-season grass. Bermudagrass growing on a poultry layer—litter—amended site was fertilized with ammonium nitrate at four rates (0, 56, 112, and 168 kg N ha−1) on 28 April and 19 July 2000, then harvested on 10 May and 18 August 2000. Five crossbred ruminally-cannulated steers (422±21.0 kg body weight (BW)) were used in a randomized complete block design with a 2×4 (harvest date×N fertilization rate) factorial arrangement to determine in situ DM and NDF degradation kinetics. Quadratic relationships were detected between N fertilization rates and N concentration in the plant when harvested on 30 May (y=0.0001x2+0.009x+27; P<0.01; R2=0.99) and 18 August (y=−0.0001x2+0.060x+18; P<0.01; R2=0.99), and both the quadratic relationships and intercepts differed (P<0.05) between harvest dates. Concentrations of NDF decreased linearly (P=0.01) with increasing N fertilization rate on both harvest dates and the intercept was higher (P<0.05) on 18 August than on 30 May. Other fiber fraction concentrations did not differ (P>0.05) across N fertilization rates. The undegraded DM fraction (fraction C) declined (P<0.01) linearly and the potential extent and DM degradation rate (kd) increased (P<0.01) linearly with increasing N fertilization rate across harvest dates. Effective DM degradability increased linearly (P<0.01) on both dates as N fertilization rates increased, but the rate of increase on 30 May was 64% greater (P<0.05) than on 18 August. When averaged across N rates, the intercept for DM fraction A and the potential extent of DM degradation was greater (P<0.05) while that of DM fraction C and kd were smaller on 30 May than on 18 August. Effective NDF degradability and kd increased (P<0.01) with N fertilization rate, and the intercept for effective NDF degradability was higher (P<0.05) on 30 May than 18 August. Therefore, N fertilization improved quality of bermudagrass marginally by increasing plant N concentration and by improving the degradation rate and effective ruminal degradability of DM and NDF." @default.
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- W2128063973 date "2003-03-01" @default.
- W2128063973 modified "2023-10-16" @default.
- W2128063973 title "In situ ruminal degradation of dry matter and fiber from bermudagrass fertilized with different nitrogen rates and harvested on two dates" @default.
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- W2128063973 doi "https://doi.org/10.1016/s0377-8401(03)00046-4" @default.
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