TABLE 4.

In vitro hydrogen consumption and production of VFAs and methane in rumen contents from conventional and meroxenic lambs

Lamb(s)Age (mo)H2 utilized (μmol)Fermentation products (μmol)
AcetatePropionateButyrateMethane
ExpectedaMeasuredExpectedbMeasured
M1 and M2113,340835672 (81)c1084000
155,4001,3501,170 (87)1004000
185,4051,3511,210 (90)1254500
215,262NDdNDNDND1,3151,547
M3 and M4114,0621,015820 (81)832700
153,210802665 (83)591700
183,920980858 (88)672700
215,262NDNDNDND1,3151,527
M585,560NDNDNDND1,3901,450
115,504NDNDNDND1,3761,547
155,495NDNDNDND1,373ND
185,640NDNDNDND1,410ND
C1 and C285,600NDNDNDND1,4001,540
115,440ND21570631,3601,641
155,560ND26082781,3891,646
185,643ND29278551,4101,658
215,262NDNDNDND1,3151,568
  • a Calculated from the stoichiometry of reductive acetogenesis: 4H2 + 2CO2 → CH3COOH + 2H2O.

  • b Calculated from the stoichiometry of methanogenesis: 4H2 + CO2 → CH4 + 2H2O.

  • c The data in parentheses indicate the amount of measured acetate expressed as a percentage of the amount of acetate from reductive acetogenesis.

  • d ND, not determined.