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Table 4 Association between physiological and rumen fermentation variables and relative methanogen abundance in beef heifers divergent for residual feed intake (RFI) 1

From: Quantitative analysis of ruminal methanogenic microbial populations in beef cattle divergent in phenotypic residual feed intake (RFI) offered contrasting diets

Items HF Diet LF Diet
Methanogens M. stadtmanae M. smithii M. ruminantium Methanogens M. stadtmanae M. smithii M. ruminantium
DMI2 -0.30 -0.05 0.14 0.06 0.13 -0.14 0.22 0.08
CH43 -0.27 -0.36 -0.36a -0.38* 0.13 -0.47** -0.07 0.03
MLW4 -0.19 -0.07 -0.17 -0.15 0.22 0.14 -0.20 -0.06
tVFA5 0.13 0.11 0.08 -0.00 0.01 0.00 -0.00 -0.18
acetate -0.01 0.06 0.11 -0.04 0.44** 0.07 -0.18 -0.14
propionate 0.01 0.00 -0.13 -0.08 -0.41** 0.30 -0.23 0.09
isobutyrate 0.07 -0.05 -0.12 0.06 0.20 -0.15 -0.21 0.08
butyrate -0.01 0.06 -0.24 -0.16 0.15 0.03 -0.08 -0.19
isovalerate -0.01 -0.05 0.08 -0.30 -0.12 -0.13 0.17 0.12
valerate -0.02 -0.06 0.11 -0.05 -0.31 -0.10 0.14 0.18
A:P6 -0.02 0.05 0.14 0.07 0.42** -0.14 0.22 0.08
pH -0.11 -0.05 0.14 0.07 -0.49** 0.14 0.22 0.08
CH4GEI7 -0.01 -0.03 -0.15 -0.15 0.03 -0.23 -0.24 -0.05
DMD8 0.21 0.16 -0.21 -0.25 0.35* 0.14 -0.21 -0.16
OMD9 0.22 0.15 -0.20 -0.14 0.34* 0.14 -0.22 -0.15
CPD10 0.14 0.20 -0.23 -0.24 0.38* 0.17 -0.22 -0.17
NDFD11 0.05 0.09 -0.18 -0.14 0.20 0.13 -0.24 -0.16
ADFD12 0.05 0.09 -0.17 -0.13 0.26 0.13 -0.24 -0.23
GED13 0.17 0.14 -0.18 -0.13 0.35 0.16 -0.25 -0.16
  1. 1Spearman correlation coefficient in boldface are different from zero (P < 0.10).
  2. 2Dry matter intake.
  3. 3Methane.
  4. 4Mean live weight.
  5. 5Total volatile fatty acids.
  6. 6Acetate:propionate ratio.
  7. 7Methane energy from gross energy intake.
  8. 8Dry matter digestibility.
  9. 9Organic matter digestibility.
  10. 10Crude protein digestibility.
  11. 11Neutral detergent fiber digestibility.
  12. 12Acid detergent fiber digestibility.
  13. 13Gross energy digestibility.
  14. *P < 0.10, **P < 0.05.