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Table 2 Effect of slow-release urea (SRU) supplementation on nutrient disappearances and gas production in RUSITEC

From: Effect of commercial slow-release urea product on in vitro rumen fermentation and ruminal microbial community using RUSITEC technique

Item Treatmenta   Pb
Control U28 U56 MU35 SEM L Q C vs. MU35
Digestibility, %
 DM 74.1 74.9 74.9 78.5 0.96 0.51 0.66 0.01
 OM 74.6 74.6 74.1 78.9 1.03 0.74 0.86 0.03
 CP 75.3 77.8 76.2 81.2 1.58 0.73 0.35 0.04
 NDF 45.7 43.4 45.3 51.9 2.46 0.93 0.56 0.10
 ADF 41.7 41.0 39.1 47.2 2.44 0.49 0.88 0.12
 Starch 98.6 98.5 97.9 98.4 1.11 0.18 0.10 0.23
Gas production, L/d 1.79 1.92 1.67 1.51 0.09 0.31 0.07 0.04
CH4, % of gas 4.22 4.34 3.85 4.34 0.39 0.30 0.32 0.81
CH4, mg/d 45.43 55.27 43.18 44.92 4.25 0.70 0.05 0.86
CH4, mg/g digested DM 6.18 7.18 5.64 5.60 0.55 0.51 0.08 0.42
  1. aControl (no SRU), U28 = control plus 0.28% SRU, U56 = control plus 0.56% SRU, and MU35 = control diet was modified by partially replacing soybean protein with 0.35% SRU (DM basis);
  2. bL, Q = linear and quadratic effects of SRU (control, U28 and U56); C vs. MU35 = Contrast between Control and MU35