Table 2.

Energy partitioning in growing beef steers fed diets of varying F:C at ad libitum intake

	Treatment1						P-value
Item	HF:C	IF:C	EF:C	LF:C	VLF:C	SEM2	Linear	Quadratic
DMI, g	7,543	8,045	8,649	7,777	8,522	423.3	0.06	0.25
GEI, Mcal	31.9	34.0	36.9	32.9	36.6	1.84	0.04	0.29
FE, Mcal	11.8	12.4	12.5	10.4	9.7	0.89	0.02	0.06
FE loss, % of GEI	36.3	36.2	34.0	30.8	26.8	1.72	<0.01	0.09
DE, Mcal	20.2	21.7	24.3	22.6	26.8	1.34	<0.01	0.81
DE, Mcal/kg	2.67	2.69	2.80	2.90	3.15	0.07	<0.01	0.07
UE, Mcal	0.90	0.88	0.90	0.82	0.78	0.052	0.04	0.54
UE loss, % of GEI	2.9	2.6	2.5	2.6	2.2	0.20	0.03	0.98
UE loss, % of DE	4.5	4.1	3.8	3.7	3.0	0.24	<0.01	0.63
Methane energy, Mcal	1.7	2.3	2.3	1.8	1.3	0.19	0.03	<0.01
Methane energy loss, % of GEI	5.2	6.5	6.3	5.2	3.7	0.44	<0.01	<0.01
Methane energy loss, % of DE	8.1	10.4	9.5	7.6	5.1	0.65	<0.01	<0.01
ME, Mcal	17.6	18.6	21.1	20.1	24.7	1.26	<0.01	0.24
ME, Mcal/kg	2.33	2.31	2.43	2.58	2.89	0.07	<0.01	<0.01
ME:DE	0.87	0.86	0.87	0.89	0.92	0.724	<0.01	<0.01
HP, Mcal	15.0	16.4	17.3	16.7	17.7	0.97	0.04	0.44
HP, % of GEI	46.9	47.4	48.6	51.1	49.2	2.51	0.22	0.80
RE, Mcal	2.7	2.5	3.6	3.5	6.8	1.02	<0.01	0.06
RE, % of GEI	8.4	7.2	8.4	10.2	18.0	2.75	<0.01	0.03

¹DRC replaced corn silage and alfalfa hay at 0% (HF:C), 22.5% (IF:C), 45% (EF:C), 67.5% (LF:C), and 83.8% (VLF:C) of dietary DM.

²Pooled standard error of the least-squares mean (n = 10 except in period 3 n = 9).