Table 5.
Carcass characteristics of steers backgrounded by either grazing corn residue and being supplemented with dried distillers plus solubles at 2.68 kg DM/steer 6 d/wk (RESIDUE), grazing a late summer planted oat-brassica forage mix (CCROP) or being fed a corn silage-based diet in drylot (DRYLOT)
| Treatments | P-value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year 1 | Year 2 | |||||||||
| Item | RESIDUE | CCROP | DRYLOT | RESIDUE | CCROP | DRYLOT | SEM1 | Year | Treatment | Year × treatment2 |
| HCW, kg | 389b | 402a | 391b | 397a | 400a | 367b | 2.14 | <0.01 | <0.01 | <0.01 |
| 12th-rib fat, cm | 1.48 | 1.55 | 1.54 | 1.68 | 1.57 | 1.58 | 0.053 | 0.06 | 0.89 | 0.24 |
| LM area, cm2 | 85.2a | 85.0a | 82.7b | 86.3a | 87.3a | 80.1b | 0.71 | <0.44 | <0.01 | 0.02 |
| Calculated YG3 | 3.29b | 3.48a | 3.49a | 3.54 | 3.42 | 3.52 | 0.065 | 0.20 | 0.39 | 0.08 |
| Marbling score4 | 402 | 419 | 423 | 426 | 428 | 435 | 5.5 | <0.01 | 0.04 | 0.35 |
| Percent Choice | 44 | 59 | 56 | 58 | 57 | 63 | 3.4 | <0.03 | 0.04 | 0.11 |
a,b
Means within a row and year with different superscripts differ (P ≤ 0.05).
1
Standard error of the least squares mean (n = 4 replications/year).
2
Year × background treatment interaction.
3
YG = yield grade.
4
Marbling score: 400 = Slight00; 450 = Slight50; 500 = Small00