Table 4.

Equations utilized to evaluate paNE_m and paNE_g using live performance or carcass data from feedlot steers consuming one of three finishing rations

Variable1,2,3,4,5	Equation	Source
NEm, Mcal/kg DM	$(b\pm \sqrt{b^2-4ac})/2a$	Zinn et al. (2008)
NEg, Mcal/kg DM	$0.877\times \mathrm{N}{\mathrm{E}}_{\mathrm{m}}-0.41$ 0	Zinn et al. (2008)
a	$0.877\times \mathrm{D}\mathrm{M}\mathrm{I}$	Zinn et al. (2008)
b	$-1\times [(0.877\times [-\mathrm{N}{\mathrm{E}}_{\mathrm{m}}\mathrm{r}\mathrm{e}\mathrm{q}\mathrm{u}\mathrm{i}\mathrm{r}\mathrm{e}\mathrm{d}])+(-0.410\times \mathrm{D}\mathrm{M}\mathrm{I})+(-\mathrm{N}{\mathrm{E}}_{\mathrm{g}}\mathrm{r}\mathrm{e}\mathrm{q}\mathrm{u}\mathrm{i}\mathrm{r}\mathrm{e}\mathrm{d})]$	Zinn et al. (2008)
c	$(-0.410)\times (-\mathrm{N}{\mathrm{E}}_{\mathrm{m}}\mathrm{r}\mathrm{e}\mathrm{q}\mathrm{u}\mathrm{i}\mathrm{r}\mathrm{e}\mathrm{d})$	Zinn et al. (2008)
NEm required, Mcal/d	$\mathrm{A}\mathrm{v}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{g}\mathrm{e}\mathrm{S}\mathrm{B}{\mathrm{W}}^{0.75}\times 0.077\mathrm{M}\mathrm{c}\mathrm{a}\mathrm{l}$	Zinn et al. (2008)
NEg required, Mcal/d	$0.0557\times \mathrm{E}\mathrm{Q}\mathrm{S}\mathrm{B}{\mathrm{W}}^{0.75}\times \mathrm{S}\mathrm{W}{\mathrm{G}}^{1.097}$	Zinn et al. (2008)
EQSBW, kg	$\mathrm{A}\mathrm{v}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{g}\mathrm{e}\mathrm{S}\mathrm{B}\mathrm{W}\times (\mathrm{S}\mathrm{R}\mathrm{W}/\mathrm{F}\mathrm{S}\mathrm{B}\mathrm{W}\mathrm{o}\mathrm{r}\mathrm{A}\mathrm{F}\mathrm{B}\mathrm{W})$	NASEM (2016)

¹NE_m = net energy for maintenance; NE_g = net energy for gain; DMI = dry matter intake; SBW = shrunk body weight; EQSBW = equivalent shrunk body weight; SWG = shrunk weight gain; SRW = standard reference weight; FSBW = final shrunk body weight; AFBW = adjusted-final body weight.

²SBW calculated as 96% of live weight and SWG calculated from initial and final SBW over an 80-d feeding period.

³SRW obtained from NASEM (2016) based on medium-framed steers from NRC (1984) reference database.

⁴AFBW is appraised final body weight at 28.0% empty fat as calculated from equations by Guiroy et al. (2001).

⁵EQSBW incorporates either final SBW or AFBW from live or carcass data, respectively.