Skip to main content

Advertisement

Table 2 Data summary and meta-analysis of relevant variables based on all of the selected studies

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

Variables No. of trials Defaunation group Faunation group Meta-analysis
n Mean SD n Mean SD I2, % SMD P-value
CH4, L/d 18 126 20.8 12.4 129 23.4 12.0 71.9 −0.602 0.037
Total VFA, mmol/L 29 211 78.8 29.7 212 87.1 31.3 44.2 −0.549 <  0.001
Individual VFA molar proportion, %
 Acetate 29 210 67.7 5.6 211 66.3 4.3 67.8 0.358 0.083
 Propionate 29 210 21.0 4.8 211 20.6 3.1 73.5 0.150 0.515
 Butyrate 27 202 8.2 2.0 203 10.2 2.8 68.3 −1.026 <  0.001
 A:P 18 78 3.6 1.6 81 3.5 0.7 77.0 −0.284 0.493
Total-tract fiber digestibility, %
 NDF 15 109 55.0 11.6 109 58.1 11.8 55.7 −2.063 <  0.001
 ADF 11 82 42.8 2.7 82 45.7 3.7 69.8 −3.075 <  0.001
  1. n number of animals, I2 percentage of heterogeneity across studies, SMD standardized mean difference, A:P acetate: propionate ratio, NDF neutral detergent fiber, ADF acid detergent fiber