Table 1.
Composition and nutrient concentration of treatment diets
| Treatments | ||
|---|---|---|
| Item | REC1 | FIN2 |
| Ingredient, % of DM | ||
| Steam-flaked corn | 24.2 | 62.0 |
| Sorghum sudan hay | 32.0 | - |
| Corn stalks | - | 8.0 |
| Molasses blend3 | 5.0 | 2.5 |
| Corn oil | - | 3.0 |
| Sweet Bran4 | 35.0 | 20.0 |
| Supplement5 | 3.8 | 4.5 |
| Nutrient analysis6, DM basis | ||
| Dry matter, % | 75.5 | 78.0 |
| Crude protein, % | 13.9 | 13.2 |
| Acid detergent fiber, % | 22.1 | 9.6 |
| Crude fat, % | 2.43 | 5.43 |
| Total starch, % | 25.9 | 52.5 |
| ME7, Mcal/kg | 2.76 | 3.20 |
| NEm7, Mcal/kg | 1.66 | 2.19 |
| NEg7, Mcal/kg | 1.05 | 1.51 |
REC, cattle fed a receiving diet for the first 56 d then transitioned to a finishing diet over 18 d.
FIN, cattle fed a finishing diet for the entire feeding period.
72 Brix Molasses Blend (Westway Feed Products LLC, Hereford, TX).
Sweet Bran (Cargill, Blair, NE).
Suplements were formulated to meet or exceed nutrient requirements for vitamins and minerals (NASEM, 2016) and mimic current feedlot practices (Samuelson et al., 2016). The REC supplement contained 15.8% urea, and provided 26.5 mg/kg monensin and 9.0 mg/kg tylosin and the FIN supplement contained 18.4% urea, and provided 38.0 mg/kg monensin and 9.0 mg/kg tylosin to the diet (Hi-Pro Feeds, Friona, TX).
Analyzed by Servi-Tech Laboratories, Amarillo, TX.
Metabolizable energy (ME), net energy for maintenance (NEm), and net energy for gain (NEg) were calculated from tabular values (NASEM, 2016).