Table 7.

Comparative statistics of dietary NE_m estimated using one of four methods incorporating gas flux from an automated head chamber system or utilizing paNE_m

	Kauffman HP2	Brouwer (1965) HP equation
Item1		No-UN HP3	Kohn-UN HP4	Waldrip-UN HP5
Live pa6
CCC	0.91	0.91	0.91	0.91
Cb	1.00	1.00	1.00	1.00
r	0.91	0.91	0.91	0.91
RMSE, %	3.43	3.45	3.43	3.43
Mean bias	−0.002	−0.008	−0.002	−0.001
P value	0.83	0.46	0.85	0.95
Slope bias	−0.09	−0.09	−0.09	−0.09
P value	0.15	0.14	0.14	0.14
Carcass pa7
CCC	0.83	0.84	0.84	0.83
Cb	0.92	0.93	0.92	0.92
r	0.90	0.91	0.91	0.91
RMSE, %	4.79	4.63	4.80	4.83
Mean bias	0.07	0.07	0.07	0.08
P value	<0.01	<0.01	<0.01	<0.01
Slope bias	−0.03	−0.03	−0.03	−0.03
P value	0.65	0.64	0.63	0.63

¹CCC = Lin’s concordance correlation coefficient (Lin., 1989); r = Pearson’s correlation coefficient; Cb = bias correction factor; RMSE = root mean square error; RMSE, % = RMSE as a percent of live pa or carcass pa.

²HP estimated using RQ utilizing equation from Kaufmann et al. (2011).

³Urinay N omitted from Brouwer (1965) HP equation.

⁴SUN utilized to estimate UN from equation by Kohn et al. (2005) when estimating HP using Brouwer (1965) equation.

⁵Nitrogen intake utilized to estimate UN from equation by Waldrip et al. (2013) when estimating HP using Brouwer (1965) equation.

⁶Live pa incorporated BW, ADG and DMI to estimate NE_m and NE_g.

⁷Carcass pa method incorporated an appraisal of EBF from Guiroy et al. (2001) where final body weight was adjusted to 28.0% EBF (AFBW) in addition to utilizing live performance to estimate NE_m and NE_g.