Table 1.
Drylot ration composition, amount fed, and proximate analysis on a dry matter basis
| Item | Year 1 | Year 2 | ||||
|---|---|---|---|---|---|---|
| TMR 1 | TMR 2 | TMR 3 | TMR 1 | TMR 2 | TMR 3 | |
| Ingredient, kg | ||||||
| Corn silage | 4.4 | 3.6 | – | 7.8 | 3.6 | – |
| Ground hay | 2.4 | – | – | – | – | – |
| DDGS1 | 2.7 | 2.5 | 2.5 | 2.9 | 2.5 | 2.5 |
| Corn stalks | 2 | 2.3 | 3.4 | 2.7 | 2.3 | 3.4 |
| Soybean hulls | – | – | 2.4 | – | – | 2.4 |
| Dry rolled corn | 2.3 | 2 | 2.4 | 1 | 2 | 2.4 |
| Supplement2 | 0.1 | 0.4 | 0.4 | 0.1 | 0.4 | 0.4 |
| Cow limit-fed TMR, kg/d | 14 | 10.9 | 11.1 | 14.5 | 10.9 | 11.1 |
| Calf intake3, kg/d | 0.9 | 1.9 | 3.1 | 0.9 | 2.7 | 3.8 |
| Number of weeks fed4 | 2 | 6 | 8 | 2 | 12 | 2 |
| Analyzed nutrient content, % | ||||||
| Dry matter | 68.1 | 68.2 | 83.4 | 62.1 | 69.3 | 87 |
| Organic matter | 88.7 | 88.4 | 87.6 | 89.5 | 89.1 | 88.9 |
| NDF5 | 38.3 | 33.7 | 41.7 | 37.6 | 33.5 | 44.4 |
| ADF6 | 18.8 | 16.8 | 23.0 | 19.5 | 16.9 | 25.6 |
| Ether extract | 3.8 | 4.2 | 4 | 3.6 | 4 | 3.6 |
| Crude protein | 9.4 | 10.1 | 10.4 | 9.1 | 9.8 | 10.4 |
| TDN7 | 72.2 | 74.2 | 68.0 | 71.5 | 74.1 | 65.3 |
1Dried distillers grains with solubles.
2Supplement contained 87.7% ground corn, 8.9% limestone, 1.8% trace mineral salt [8.5% Ca as calcium carbonate, 5% Mg as magnesium oxide and magnesium sulfate, 7.6% K as potassium chloride, 6.7% Cl as potassium chloride, 10% S as S8, prilled, 0.5% Cu as copper sulfate and Availa-4 (Zinpro Performance Minerals; Zinpro Corp, Eden Prairie, MN), 2% Fe as iron sulfate, 3% Mn as manganese sulfate and Availa-4, 3% Zn as zinc sulfate and Availa-4, 278 mg/kg Co as Availa-4, 250 mg/kg I as calcium iodate, 150 mg/kg Se as sodium selenite, 2,205 KIU/kg VitA as retinyl acetate, 662.5 KIU/kg VitD as cholecalciferol, 22,047.5 IU/kg VitE as DL-α-tocopheryl acetate, and less than 1% crude protein, fat, crude fiber, salt], 0.1% Rumensin 90 (198 g monensin/kg, Rumensin 90; Elanco Animal Health, Greenfield, IN), and 1.5% fat.
3Calves were offered free-choice access to same.
4There were differences in the amount of weeks diets were fed due to ingredient availability.
5Neutral detergent fiber.
6Acid detergent fiber.
7Total digestible nutrients; calculated %TDN = 90.82 + (CP × 0.0353) − (ADF × 1.01).