Table 1. Ingredients, chemical analysis, and calculated energy for the primary diets.
| Primary diet treatment | |||
|---|---|---|---|
| Low roughage | High roughage | ||
| Ingredient, % | |||
| Corn grain (flaked) | 62.3 | – | |
| Dried distillers grains with solubles (corn based) | 15.0 | – | |
| Tallow | 2.5 | – | |
| Molasses (cane) | 6.0 | – | |
| Alfalfa hay (early bloom) | 6.0 | – | |
| Wheat hay | 6.0 | – | |
| Sudan grass hay | – | 100 | |
| Limestone | 1.12 | – | |
| Urea | 0.57 | – | |
| Magnesium oxide | 0.14 | – | |
| Cobalt sulphate (21% Co) | 0.00004 | – | |
| Copper sulphate (25.4% Cu) | 0.002 | – | |
| Manganese sulphate | 0.0095 | – | |
| Potassium iodide (68% I) | 0.000045 | – | |
| Salt | 0.3 | – | |
| Rumensin 90a (41.2 g/kg) | 0.02 | – | |
| Zinc Oxide (78% Zn) | 0.0027 | – | |
| Chemical analysis | |||
| Dry matter (DM), % | 83.6 | 88.8 | |
| CP, % DM | 12.6 | 8 | |
| NDF, % DM | 17.9 | 60.3 | |
| ADF, % DM | 8.6 | 41.9 | |
| Calculated energy | |||
| TDN, % DM | 84.7 | 56.4 | |
| NEm, MJ/kg | 8.64 | 4.97 | |
| NEg,MJ/kg | 5.89 | 2.57 | |
The primary diet treatments were a total mixed ration with 12% forage (low roughage) or 100% Sudan grass hay (high roughage). Ingredient composition is listed on an as-fed basis. Chemical analysis and energy calculations were performed by Cumberland Valley Analytical Services, Hagerstown, MD, U.S.A. using the formulas of Weiss [20] and NRC [21].
aElanco Animal Health, Greenfield, IN, U.S.A.