Table 1.
Composition of experimental substrates/diets (DM basis, Exp. 1 and 2)
| Item | Substrates/diets1 | |
|---|---|---|
| CON | 15CG | |
| Ingredient, % | ||
| Corn silage | 10.0 | 10.0 |
| Dry-rolled corn | 31.0 | 12.9 |
| Corn gluten feed | 35.0 | 35.0 |
| Soybean hulls | 20.0 | 20.0 |
| Soybean meal | 0.0 | 3.1 |
| Limestone | 1.4 | 1.4 |
| Mineral-vitamin premix2 | 0.1 | 0.1 |
| Feed additive premix3 | 2.2 | 2.2 |
| Crude glycerin4 | 0.0 | 15.0 |
| Salt | 0.3 | 0.3 |
| Nutrient composition, % | ||
| DM | 65.4 | 65.2 |
| CP | 14.3 | 14.2 |
| NDF | 39.9 | 35.4 |
| Na | 0.12 | 0.56 |
1CON = Control diet, without crude glycerin, 15CG = 15% added crude glycerin.
2Formulated to provide 0.1 mg/kg Co; 10 mg/kg Cu; 0.6 mg/kg I; 60 mg/kg Mn; 0.25 mg/kg Se; 60 mg/kg Zn; 2,200 IU/kg of vitamin A; and 22 IU/kg vitamin E in the total diet DM.
3Formulated to provide 300 mg monensin (Rumensin, Elanco Animal Health, Greenfield, IN), 90 mg tylosin (Tylan, Elanco Animal Health, Greenfield, IN), and 0.4 mg melengestrol acetate (MGA, Pfizer Animal Health, Exton, PA) per heifer daily.
4Crude glycerin composition: 81.5% glycerol, 13.3% water, 6.3% ash, 2.5% Na, and <0.02% methanol.