Table 2.
Chemical analysis of diets (as-fed basis; Exp. 1)1
| STTD P2, % | |||||||
|---|---|---|---|---|---|---|---|
| Item, % | 0.26 | 0.30 | 0.33 | 0.38 | 0.43 | 0.48 | 0.53 |
| Dry matter | 87.78 | 87.75 | 88.18 | 87.84 | 87.87 | 88.02 | 88.14 |
| Crude protein | 19.6 | 20.2 | 21.4 | 21.5 | 21.4 | 20.3 | 20.7 |
| Ether extract | 2.4 | 2.4 | 2.3 | 2.3 | 2.3 | 2.4 | 2.3 |
| Ash | 3.81 | 4.25 | 4.56 | 4.98 | 4.88 | 4.93 | 5.14 |
| Calcium | 0.65 | 0.74 | 0.73 | 0.85 | 0.90 | 0.82 | 0.88 |
| Phosphorus | 0.44 | 0.49 | 0.54 | 0.64 | 0.66 | 0.71 | 0.75 |
1A representative sample of each diet was collected from 6 feeders, homogenized, and then analyses were conducted on composite samples (Ward Laboratories, Inc., Kearney, NE). Low (0.26% STTD P) and high (0.53% STTD P) diets were blended at the farm by a robotic feeding system to create the 0.30%, 0.33%, 0.38%, 0.43%, and 0.48% STTD P dietary treatments.
2STTD P = standardized total tract digestible phosphorus.