Table 4.

Phenotypic repeatability of methane, carbon dioxide, and dry matter intake through different averaging periods for steers, heifers, and bulls

	Steers					Heifers					Bulls
Number of animals	467					195					90
Repeat period	n 1	CH4	CO2	n 1	DMI	n 1	CH4	CO2	n 1	DMI	n 1	CH4	CO2	n 1	DMI
Within day	39,430	0.16	0.21	N/A	N/A	13,391	0.14	0.24	N/A	N/A	2,039	0.20	0.22	N/A	N/A
1 d period	11,599	0.34	0.44	12,209	0.39	3,796	0.32	0.50	4,236	0.43	1,008	0.24	0.34	2,310	0.45
2-d period	6,055	0.44	0.55	6,105	0.56	2,032	0.38	0.58	2,118	0.59	647	0.29	0.37	1,155	0.60
4-d period	3,307	0.55	0.65	3,256	0.65	1,126	0.45	0.69	1132	0.70	425	0.34	0.47	616	0.67
5-d period	2,557	0.58	0.67	2,442	0.72	9,03	0.48	0.71	876	0.72	374	0.26	0.47	462	0.71
10-d period	1,328	0.70	0.76	1,221	0.81	462	0.61	0.78	438	0.84	242	0.32	0.52	231	0.79
15-d period	928	0.74	0.80	814	0.85	310	0.69	0.82	292	0.84	176	0.32	0.61	154	0.82

¹ Number of observations in repeatability analysis.

² N/A, not available.