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Table 3 Treatment effects on ruminal pH, VFA molar proportions and BUN

From: Influence of ruminal degradable intake protein restriction on characteristics of digestion and growth performance of feedlot cattle during the late finishing phase

  Urea fermentation potential P – value  
Item 0 0.6 1.2 Linear Quadratic SEM
Ruminal pH 5.75 5.86 5.84 0.51 0.59 0.10
Ruminal N-NH (mg/dL) 5.37 4.69 3.89 0.05 0.91 0.56
Total VFA (mM) 95.9 105 94.2 0.83 0.21 5.4
Ruminal VFA (mol/100 mol)       
Acetate 46.8 49.2 57.5 0.08 0.54 4.6
Propionate 36.1 30.1 20.3 0.04 0.74 5.7
Isobutyrate 1.19 1.17 0.89 0.30 0.60 0.23
Butyrate 12.0 15.1 17.7 0.17 0.93 3.1
Isovalerate 1.53 1.77 0.83 0.19 0.20 0.41
Valerate 2.36 2.63 2.83 0.42 0.95 0.48
Acetate:propionate 1.34 1.85 2.94 0.05 0.63 0.59
Methane1 0.35 0.44 0.60 0.04 0.70 0.09
BUN (mg/dL) 4.43 2.80 1.45 <0.01 0.53 0.25
  1. 1Methane production (mol/mol of glucose equivalent fermented) was estimated based on the theoretical fermentation balance for observed molar distribution of VFA [16].