Table 4.

Linear regression models for predicting carbon dioxide production rate from animal traits

Emissions	Order of fitting explanatory variables2							Coefficients for significant variables5
trait1	First	Second	Third	F – value3	F –probability3	R 2	BIC4	b0	b1	b2
TARC heifers
CPR, g/d	DMI, kg/d			69.86	<0.001	0.37	2061	3336 ± 294	299.2 ± 35.8
	DMI, kg/d	Age, d		4.31	0.040	0.40	2061	2211 ± 615	265.9 ± 38.8	3.75 ± 1.81
	DMI, kg/d	Cohort		20.20	<0.001	0.70	2002
	DMI, kg/d	BW, kg		35.71	<0.001	0.52	2034	1505 ± 401	138.0 ± 41.4	8.85 ± 1.48
	DMI, kg/d	BW, kg	Cohort	22.43	<0.001	0.79	1967
CPR, g/d	BW, kg			106.02	<0.001	0.48	2040	1485 ± 417	12.06 ± 1.17
	BW, kg	Age, d		0.98	0.325	0.48	2044
	BW, kg	Cohort		13.52	<0.001	0.70	2003
	BW, kg	DMI, kg/d		11.11	<0.001	0.52	2034	1505 ± 401	8.85 ± 1.48	138.0 ± 41.4
	BW, kg	DMI, kg/d	Cohort	22.43	<0.001	0.79	1967
BIN steers
CPR, g/d	DMI, kg/d			281.57	<0.001	0.47	6322	3401 ± 334	461.7 ± 24.8
	DMI, kg/d	Age, d		84.7	<0.001	0.58	6252	2106 ± 329	278.6 ± 26.7	5.65 ± 0.61
	DMI, kg/d	Cohort		28.28	<0.001	0.69	6193
	DMI, kg/d	BW, kg		111.77	<0.001	0.60	6231	1041 ± 364	210.9 ± 29.0	8.84 ± 0.84
	DMI, kg/d	BW, kg	Cohort	29.98	<0.001	0.77	6093
CPR, g/d	BW, kg			376.16	<0.001	0.54	6275	1483 ± 387	12.93 ± 0.67
	BW, kg	Age, d		29.61	<0.001	0.58	6252	1326 ± 372	9.44 ± 0.91	3.92 ± 0.72
	BW, kg	Cohort		32.61	<0.001	0.75	6125
	BW, kg	DMI, kg/d		53.03	<0.001	0.60	6231	1041 ± 364	8.84 ± 0.84	210.9 ± 29.0
	BW, kg	DMI, kg/d	Cohort	29.98	<0.001	0.77	6093
CPR, g/d	MBW, kg			373.02	<0.001	0.54	6277	−1099 ± 522	85.42 ± 4.42
	MBW, kg	Age, d		31.37	<0.001	0.58	6252	−564 ± 508	62.00 ± 5.95	4.00 ± 0.72
	MBW, kg	Cohort		26.22	<0.001	0.75	6231
	MBW, kg	ADG, kg/d		79.59	<0.001	0.63	6211	−1470 ± 470	68.39 ± 4.40	1357 ± 152
	MBW, kg	ADG, kg/d	Cohort	29.22	<0.001	0.79	6076

¹CPR = carbon dioxide production.

²MBW denotes metabolic body weight.

³For the last explanatory variable fitted in the model.

⁴BIC = Bayesian information criterion.

⁵The intercept (b₀), and the regression coefficients for the first (b₁) and second (b₂) explanatory variables.