Table 6.
Effects of wet distiller’s grains with solubles (WDGS) and nonprotein N (NPN) on carcass characteristics by finishing steers in Exp. 1
| Item | Control | WDGS, % of DM | SE | |||||
|---|---|---|---|---|---|---|---|---|
| 15% | 30% | |||||||
| NPN, % of DM | NPN, % of DM | |||||||
| 0 | 1.5 | 3.0 | 0 | 1.5 | 3.0 | |||
| Hot carcass weight, kg1,2 | 385 | 379 | 385 | 384 | 376 | 376 | 376 | 6 |
| Dressing percent1,3 | 65.12 | 64.26 | 63.97 | 64.28 | 63.95 | 64.04 | 63.94 | 0.35 |
| Fat thickness, cm | 1.24 | 1.21 | 1.24 | 1.29 | 1.23 | 1.20 | 1.25 | 0.08 |
| LM area, cm2 | 92.31 | 91.10 | 89.99 | 91.96 | 93.21 | 91.66 | 92.69 | 1.53 |
| Yield grade | 2.77 | 2.75 | 2.86 | 2.83 | 2.63 | 2.67 | 3.06 | 0.20 |
| Marbling score4 | 400 | 387 | 405 | 402 | 395 | 400 | 393 | 11 |
| Average Choice and Prime, % | 11.49 | 4.20 | 9.20 | 11.81 | 9.03 | 14.65 | 10.56 | - |
| Choice, % | 33.89 | 36.39 | 42.05 | 36.79 | 35.14 | 30.21 | 28.89 | - |
| ≥ Choice, % | 45.38 | 40.59 | 51.25 | 48.59 | 44.17 | 44.86 | 39.44 | - |
| Select, % | 54.62 | 58.02 | 48.75 | 48.23 | 53.75 | 51.08 | 57.60 | - |
| Standard, % | 0 | 1.39 | 0 | 3.18 | 2.08 | 4.06 | 2.95 | - |
| Yield grade 1, %1,2 | 14.24 | 13.85 | 10.14 | 11.35 | 25.14 | 15.24 | 22.81 | - |
| Yield grade 2, % | 39.90 | 52.19 | 47.36 | 47.26 | 42.92 | 49.51 | 40.17 | - |
| Yield grade 3, %1,3,5 | 41.53 | 21.18 | 35.63 | 32.50 | 23.61 | 32.74 | 26.88 | - |
| Yield grade 4 and 5, %5 | 4.34 | 12.78 | 6.88 | 8.89 | 8.33 | 2.50 | 10.14 | - |
1Control vs. 30% WDGS (P < 0.05).
215 vs. 30% WDGS (P < 0.01).
3Control vs. 15% WDGS (P < 0.001).
4Marbling score: 300 = slight; 400 = small, etc.
5Quadratic effect of NPN (P < 0.10).