Table 2.
Ingredient and chemical composition of experimental diets fed during backgrounding and finishing phases to feedlot steers
| Treatment | ||||
|---|---|---|---|---|
| Item | Control | 0.5% EB | 1.0% EB | 2.0% EB |
| Backgroundinga | ||||
| DM | 47.5 | 48.2 | 48.0 | 49.0 |
| OM | 93.0 | 93.1 | 92.9 | 93.5 |
| CP | 12.3 | 12.2 | 12.1 | 12.1 |
| NDF | 35.5 | 33.6 | 34.5 | 31.9 |
| ADF | 19.1 | 18.5 | 19.5 | 19.0 |
| NEmb | 1.76 | 1.79 | 1.75 | 1.77 |
| NEgc | 1.17 | 1.19 | 1.16 | 1.18 |
| Finishingd | ||||
| DM | 80.7 | 82.2 | 81.7 | 81.2 |
| OM | 96.4 | 96.2 | 95.7 | 96.1 |
| CP | 12.4 | 12.6 | 11.8 | 11.8 |
| NDF | 21.1 | 19.0 | 19.1 | 19.4 |
| ADF | 7.44 | 7.68 | 6.67 | 6.26 |
| NEm | 2.20 | 2.20 | 2.23 | 2.25 |
| NEg | 1.53 | 1.53 | 1.56 | 1.57 |
The pellet supplied per tonne of dietary DM: 531 kg barley chop, 90 kg canola meal, 250 kg calcium carbonate, 19.5 kg molasses, 28.5 kg salt, 9.9 kg feedlot premix, 19.8 kg urea, 0.66 kg vitamin E (50%), and 9.9 kg canola meal. The feedlot premix in the supplement contained per kilogram of dietary DM: 15 mg Cu, 65 mg Zn, 28 mg Mn, 0.7 mg I, 0.2 mg Co, 0.3 mg Se, 6000 IU vitamin A, 600 IU vitamin D, and 47 IU of vitamin E.
CP, crude protein.
aBackgrounding diet consisted of 60% barley silage, 35% barley grain, and 5% supplement (DM basis)
b,cNet energy for maintenance and gain, respectively, is calculated by summative energy equation (NASEM, 2016).
dFinishing diet consisted of 10% barley silage, 85% barley grain, and 5% supplement (DM basis)