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Table 3 Methane emissions, ruminal VFA profiles and total-tract fiber digestibility dynamics during the linear phase and plateau phase

From: Dynamics of methanogenesis, ruminal fermentation and fiber digestibility in ruminants following elimination of protozoa: a meta-analysis

  Meta-regression analysis for the linear phase Meta-analysis for the plateau phase
Duration, wk No. of trials I2, % Intercept P-value Coefficient P-value Adjusted R2, % Duration, wk No. of trials I2, % Pooled effect size P-value
CH4 ≤ 12 13 76.2 −5.484 0.001 0.486 0.003 76.8 ≥ 11 9 0.0 0.313 0.039
TVFA ≤ 12 12 35.5 −1.883 0.008 0.132 0.048 99.9 ≥ 11 19 46.7 −0.424 <  0.001
Individual VFA molar proportion  
 Acetate ≤ 11 11 76.8 −4.086 0.004 0.563 0.004 76.7 ≥ 7 22 47.5 0.748 <  0.001
 Propionate ≤ 11 11 84.5 7.306 <  0.001 −0.898 <  0.001 92.2 ≥ 7 22 51.2 −0.366 0.033
 Butyrate ≤ 11 11 80.6 −7.059 <  0.001 0.732 0.001 92.3 ≥ 7 20 54.0 −0.582 0.002
 A:P ≤ 11 10 78.6 −6.737 0.001 0.884 0.002 90.8 ≥ 7 10 59.2 0.915 0.016
Total-tract fiber digestibility  
 NDF ≤ 23 15 55.7 −4.458 <  0.001 0.153 0.005 85.0      
 ADF ≤ 23 11 69.8 −6.276 0.001 0.213 0.030 45.1      
  1. I2, percentage of heterogeneity across studies; Intercept, estimate of the effect size after defaunation; Coefficient, estimate of the change in effect size per week following defaunation; Adjusted R2, percentage of between-study variance explained by the defaunation duration; TVFA, total VFA