Herbage mass

SEM

P-value

HHM

LHM

Methane emission (kg/cow/d)

374

353

34.9

0.685

Methane emission (g/kg FPCM/d)

19.1

17.6

2.52

0.580

Methane yield

as Gross Energy intake (Y_m)

6.6

6.8

0.87

0.788

as g methane/kg DMI

20.5

21.5

2.73

0.712