Table 3.

Characterization of enteric emissions and methane traits in finishing beef cattle ranked for residual methane emissions, sex, and genotype

			RME ranking1				Sex			Genotype
Traits2	Mean3	SD4	High, n = 84	Medium, n = 114	Low, n = 84	SEM5	Steers, n = 128	Heifers, n = 154	SEM5	Late, n = 219	Early, n = 63	SEM5	P-value, RME ranking	P-value, sex	P-value, genotype
DME, g/d	229.2	46.0	265.0a	224.0b	184.4c	8.8	232.0	217.0	12.1	226.4	222.5	8.7	<0.0001	0.38	0.30
DCE, kg/d	8.4	1.0	8.8a	8.3b	8.1c	0.2	8.6	8.2	0.3	8.4	8.4	0.2	<0.0001	0.39	0.92
RME, g/d	0.00	34.1	38.0a	-0.1b	-40.3c	1.8	-0.7	-0.9	1.8	0.6	-2.2	1.6	<0.0001	0.94	0.25
RMECO2, g/d	0.00	30.2	24.6a	0.7b	-31.2c	2.4	-1.2	-2.7	2.3	0.6	-4.6	2.1	<0.0001	0.65	0.11
MY, g/kg DMI	22.10	4.1	25.2a	21.6b	17.7c	0.7	21.9	21.1	1.0	21.9a	21.1b	0.7	<0.0001	0.59	0.01
MADG, g/kg ADG	171.7	40.7	191.3a	167.1b	144.1c	6.6	166.8	168.1	8.5	173.8a	161.2b	6.4	<0.0001	0.91	0.02
MI, g/kg CW	0.70	0.15	0.81a	0.67b	0.57c	0.03	0.68	0.69	0.05	0.67a	0.70b	0.03	<0.0001	0.83	0.01

¹High, RME was >0.5 SD above the mean; medium, RME was±0.5 SD above and below the mean; low, RME was >−0.5 SD below the mean.

²DME, daily methane emissions; DCE, daily carbon dioxide emissions; RME, residual methane emissions; RME_CO2, residual methane emissions calculated with carbon dioxide; MY, methane yield; MADG, methane emissions per kg of ADG; MI, methane intensity.

³Overall trait mean.

⁴Overall trait standard deviation.

⁵SEM, pooled standard error.

^a,b,cLeast squares means within main effect and a row with different superscripts differ.