Table 5.
Minerals in herbage from wheat pasture grazed by stocker cattle supplemented with free-choice minerals on the Southern Plains Experimental Range near Ft. Supply, OK (experiment 1)
| Mineral supplemented | ||||
|---|---|---|---|---|
| Item/period | No | Yesa | SE | P-value |
| Ca, % of DM | ||||
| First 28 d | 0.26 | 0.30 | 0.030 | 0.53 |
| Second 28 d | 0.25 | 0.29 | 0.018 | 0.22 |
| Third 28 d | 0.26 | 0.26 | 0.025 | 0.99 |
| Overall, 84 d | 0.26 | 0.28 | 0.012 | 0.28 |
| P, % of DM | ||||
| First 28 d | 0.23 | 0.25 | 0.053 | 0.82 |
| Second 28 d | 0.18 | 0.18 | 0.029 | 0.88 |
| Third 28 d | 0.18 | 0.19 | 0.016 | 0.78 |
| Overall, 84 d | 0.20 | 0.21 | 0.032 | 0.83 |
| Mg, % of DM | ||||
| First 28 d | 0.12 | 0.16 | 0.019 | 0.29 |
| Second 28 d | 0.12 | 0.16 | 0.021 | 0.35 |
| Third 28 d | 0.13 | 0.13 | 0.007 | 0.55 |
| Overall, 84 d | 0.12 | 0.15 | 0.015 | 0.33 |
| K, % of DM | ||||
| First 28 d | 2.1 | 2.3 | 0.060 | 0.15 |
| Second 28 d | 1.5 | 1.5 | 0.019 | 0.82 |
| Third 28 d | 1.5 | 1.4 | 0.016 | 0.06 |
| Overall, 84 d | 1.7 | 1.7 | 0.027 | 0.45 |
| S, % of DM | ||||
| First 28 d | 0.22 | 0.22 | 0.007 | 0.46 |
| Second 28 d | 0.19 | 0.19 | 0.005 | 0.55 |
| Third 28 d | 0.21 | 0.20 | 0.006 | 0.36 |
| Overall, 84 d | 0.21 | 0.20 | 0.002 | 0.70 |
| Na, mg/kg of DM | ||||
| First 28 d | 11.0 | 28.7 | 8.06 | 0.26 |
| Second 28 d | 28.0 | 15.8 | 4.28 | 0.18 |
| Third 28 d | 20.0 | 24.9 | 5.22 | 0.57 |
| Overall, 84 d | 19.7 | 23.1 | 3.87 | 0.59 |
| Cu, mg/kg of DM | ||||
| First 28 d | 3.6 | 4.3 | 0.56 | 0.45 |
| Second 28 d | 3.1 | 4.6 | 0.70 | 0.29 |
| Third 28 d | 3.5 | 4.6 | 0.50 | 0.27 |
| Overall, 84 d | 3.4 | 4.5 | 0.56 | 0.30 |
| Fe, mg/kg of DM | ||||
| First 28 d | 778 | 1,132 | 172.4 | 0.28 |
| Second 28 d | 1,270 | 1,411 | 463.8 | 0.85 |
| Third 28 d | 1,020 | 1,095 | 300.9 | 0.88 |
| Overall, 84 d | 1,023 | 1,212 | 304.8 | 0.70 |
| Mn, mg/kg of DM | ||||
| First 28 d | 197 | 195 | 62.9 | 0.98 |
| Second 28 d | 168 | 190 | 38.4 | 0.73 |
| Third 28 d | 163 | 165 | 34.3 | 0.57 |
| Overall, 84 d | 176 | 193 | 45.1 | 0.81 |
| Mo, mg/kg of DM | ||||
| First 28 d | 0.16 | 0.19 | 0.062 | 0.75 |
| Second 28 d | 0.20 | 0.21 | 0.056 | 0.91 |
| Third 28 d | 0.18 | 0.14 | 0.045 | 0.68 |
| Overall, 84 d | 0.18 | 0.18 | 0.043 | 0.95 |
| Zn, mg/kg of DM | ||||
| First 28 d | 14.6 | 15.6 | 1.12 | 0.58 |
| Second 28 d | 14.6 | 14.8 | 0.96 | 0.88 |
| Third 28 d | 15.8 | 15.2 | 0.46 | 0.43 |
| Overall, 84 d | 15.0 | 15.1 | 0.83 | 0.87 |
| Se, ng/kg of DM | ||||
| First 28 d | 39.8 | 39.8 | 14.00 | 0.99 |
| Second 28 d | 36.5 | 38.5 | 5.06 | 0.81 |
| Third 28 d | 34.3 | 37.8 | 6.21 | 0.73 |
| Overall, 84 d | 36.8 | 38.7 | 8.05 | 0.89 |
aFree-choice mineral (Wheat Pasture Pro Mineral; Land O Lakes Purina Feed, LLC, Saint Paul, MN) supplied in ground-style mineral feeders (Sioux Steel Company; Sioux City, SD).