Table 6.
Least-square means and statistical testing for the difference of methods to determine HP, UN, and paNEm and paNEg using live or carcass data
| Methodology | ||||||||
|---|---|---|---|---|---|---|---|---|
| Item | Kaufmann HP1 |
No-UN HP2 |
Kohn-UN HP3 |
Waldrip-UN HP4 |
Live pa5 |
Carcass pa6 |
Pooled SEM7 |
P value8 |
| HP, Mcal/d | 24.57 | 24.65 | 24.56 | 24.54 | — | — | 0.279 | 0.99 |
| UN, g/d | — | — | 64.10 | 79.67 | — | — | 1.666 | <0.01 |
| NEm, Mcal/kg DMI9 | 2.24 | 2.24 | 2.24 | 2.24 | 2.23 | 2.31 | 0.194 | 0.49 |
| NEg, Mcal/kg DMI9 | 1.55 | 1.55 | 1.55 | 1.55 | 1.55 | 1.62 | 0.170 | 0.39 |
1HP estimated using RQ utilizing equation from Kaufmann et al. (2011).
2Urinay N omitted from Brouwer (1965) HP equation.
3SUN utilized to estimate UN from equation by Kohn et al. (2005) when estimating HP using Brouwer (1965) equation.
4Nitrogen intake utilized to estimate UN from equation by Waldrip et al. (2013) when estimating HP using Brouwer (1965) equation.
5Live pa incorporated, BW, ADG and DMI to estimate NEm and NEg.
6Carcass 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 NEm and NEg.
7Standard error of the mean.
8ANOVA P value.
9NEm and NEg estimated using HP, recovered energy from NRC (1984), and Galyean et al. (2016) or from Zinn et al. (2008) equations whereas the carcass 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.