Table 1.
Dietary ingredients and calculated nutritional composition of receiving and step-up diets fed to steers
| Adaptation diets | |||
|---|---|---|---|
| Items | Receiving | Step-up 2 | Step-up 3 |
| Days on feed | 8 | 7 | 7 |
| Period included in the study | No | Yes | Yes |
| Ingredient, % DM | |||
| Steam-flaked corn (330 g/L) | 22.00 | 36.00 | 50.10 |
| Wet corn gluten feed (sweet bran, cargill corn milling) | 54.00 | 36.85 | 27.25 |
| Cottonseed hulls | 20.00 | 10.00 | 5.00 |
| Corn silage | 10.00 | 10.00 | |
| Sorghum silage | 2.50 | 2.50 | |
| Supplementa | 2.00 | 2.00 | 2.00 |
| Urea | 0 | 0 | 0.50 |
| Limestone | 2.00 | 1.65 | 1.65 |
| Premixb | 0 | 1.00 | 1.00 |
| Calculated compositionc, DM basis | |||
| DM, % as-is | 66.45 | 62.89 | 64.74 |
| CP | 17.15 | 14.62 | 14.62 |
| Ca | 0.79 | 0.67 | 0.65 |
| P | 0.68 | 0.56 | 0.49 |
| K | 1.22 | 1.06 | 0.91 |
| S | 0.31 | 0.25 | 0.22 |
| NEm, Mcal/kgd | 1.68 | 1.83 | 1.94 |
| NEg, Mcal/kgd | 1.10 | 1.21 | 1.30 |
aSupplement contained (DM basis) as follows: carrier (cottonseed meal), 73.2699%; potassium chloride, 10%; sodium chloride, 15%; cobalt carbonate, 0.0022%; copper sulfate, 0.1965%; iron sulfate, 0.0833%; ethylenediamine dihydroiodide, 0.0031%; manganous oxide, 0.167%; selenium premix (0.2% Se), 0.125%; zinc sulfate, 0.9859%; vitamin A (1,000,000 IU/g), 0.0099%; and vitamin E (500 IU/g), 0.1575%.
bPremix contained cottonseed meal for control diet; 24.8% (DM basis) yeast commercial product (ABVista) for LY diet; and 49.59% (DM basis) yeast commercial product for HY diet. Cottonseed meal was used as a carrier for the yeast premixes. Inclusions were based on an expected DMI of 9.5 kg/d.
cCalculated composition based on regularly analyzed individual ingredients used at the Burnett Center.
dCalculated composition using tabular values (NRC, 2000).