Table 3.

Emission of CH₄ for two contrasting levels of RFI of the animals: low RFI (LRFI, −0.78 ± 0.22 kg DMI/d) and high RFI (HRFI, 0.83 ± 0.34 kg DMI/d) steers

	Treatment			P value
	LRFI	HRFI	SEM	Treatment	Period	Treat*Per
Emissions, g/d	194	265	15.9	0.009	0.423	0.911
CH4/kg DMI, g/kg	20.3	28.1	1.76	0.021	0.107	0.390
Ym, %	6.72	9.17	0.580	0.027	0.102	0.391
CH4/kg NDFI, g/kg	43.0	59.2	3.73	0.024	0.103	0.396
CH4/kg ADFI, g/kg	65.4	92.0	5.69	0.015	0.106	0.398

Treat*Per = interaction between treatment and period; Emissions = daily CH₄ emissions; CH₄/kg DMI = CH₄ emission per kilogram of dry matter intake; Ym = methane yield; CH₄/kg NDFI = CH₄ emission per kilogram of neutral detergent fiber intake; CH₄/kg ADFI = CH₄ emission per kilogram of acid detergent fiber. Values are average per treatment (n = 8/treatment).