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Table 2 In vitro fermentation constants, degradability and methane production of different forages

From: In vitro rumen fermentation kinetics, metabolite production, methane and substrate degradability of polyphenol rich plant leaves and their component complete feed blocks

Attributes Vigna sinensis Hay Acacia nilotica leaves Ziziphus nummularia leaves SEM Significance (P value)
Fermentation kinetics
Potential gas production (ml/200 mg DM) 42.1 40.9 37.9 0.926 0.021
Rate constant (c) 0.044 0.061 0.049 0.005 0.001
Half time (t1/2, h) 15.6 11.4 14.0 0.71 0.018
Lag phase(L, h) 1.90 3.33 5.37 1.16 0.012
Degradability and methane production
 DMD % 57.7b 65.0a 54.9c 0.31 < 0.001
 OMD % 64.6b 68.8a 60.2c 0.59 < 0.001
 Gas production (mL/g) 137b 151a 126c 3.1 < 0.001
 Gas production (mL/g DDM) 237a 232ab 229b 2.5 0.024
 Gas production (mL/g DOM) 240 250 239 5.2 0.541
 Methane production (mL/g DM) 28.4a 12.7c 23.0b 0.95 < 0.001
 Methane production (mL/g DDM) 49.1a 19.6c 41.9b 1.36 < 0.001
 Methane production (mL/g OMD) 49.8a 22.3c 43.8b 0.70 < 0.001
 Partitioning factor (g/mL) 4.16b 3.99a 4.18b 0.038 0.042
  1. Means bearing different superscript (a, b, c) differ significantly
  2. μm = maximum rate of GP (b × c) At the inflection point (Y = b/2), i.e. inflection occurs halfway to the maximum gas volume and thus, t1/2 = L + (μm × b/2)