Table 7.
Carcass-adjusted performance, empty body fat, empty body weight, adjusted final body weight, and performance calculated energy of cattle fed a receiving or finishing diet upon arrival to the feedlot
| Item | Treatments | SEM3 | P-value | |
|---|---|---|---|---|
| REC1 | FIN2 | |||
| Carcass-adjusted performance | ||||
| Final body weight4, kg | 631 | 636 | 6.15 | 0.46 |
| ADG5, kg | 1.46 | 1.47 | 0.02 | 0.47 |
| G:F6 | 0.173 | 0.178 | 0.002 | 0.06 |
| Empty body fat7, % | 30.54 | 31.06 | 0.35 | 0.15 |
| Empty body weight8, % | 569 | 573 | 5.23 | 0.46 |
| AFBW9, % | 598 | 594 | 11.75 | 0.42 |
| Performance-calculated NE10 | ||||
| NEm, Mcal/kg | 2.07 | 2.12 | 0.03 | 0.04 |
| NEg, Mcal/kg | 1.41 | 1.45 | 0.02 | 0.04 |
REC, cattle fed a receiving diet for the first 56 d then transitioned to a finishing diet over 18 d.
FIN, cattle fed a finishing diet for the entire feeding period.
SEM, standard error of the mean.
Carcass-adjusted final BW = HCW/0.6465 where BW = body weight and HCW = hot carcass weight.
Carcass-adjusted ADG = (carcass adjusted final BW − initial shrunk BW)/days on feed.
Carcass-adjusted G:F = carcass adjusted ADG/DMI where DMI = dry matter intake.
EBF = 17.76207 + (4.68142 × fat thickness) + (0.01945 × HCW) + (0.81855 × Quality grade) − (0.06754 × ribeye area) from Guiroy et al. (2001).
EBW = (1.316 × HCW) + 32.29 from Guiroy et al. (2001).
AFBW = adjusted final BW, AFBW = [EBW + (28 − EBF) × 14.26]/0.891 (Guiroy et al., 2001).
Performance-calculated dietary NEm = −b ± √(b2 − 4ac)/2c and performance-calculated dietary NEg = 0.877 × NEm − 0.41, where a=− 0.41 × EM; b = 0.877 × EM + (0.41 × DMI) + EG; and c = − 0.877 × DMI (Zinn and Shen, 1998). Energy maintenance (EM; Mcal/d) was estimated using EM = 0.077 × ABW0.75, where ABW = average BW × 0.96 (Lofgreen and Garrett, 1968) and energy gain (EG; Mcal/d) was estimated using the equation 0.0557 × (ABW × 478/AFBW0.75) × ADG1.097.