Table 3.
Effects of cobalt concentration and source on performance of finishing steers
| Item | Carbonate | Acetate | Lactate | SEM | Contrasts, P < | ||||
|---|---|---|---|---|---|---|---|---|---|
| 30 | 30 | 60 | 30 | 60 | C vs O1 | A vs L2 | 30 vs 603 | ||
| n, head | 20 | 20 | 20 | 20 | 20 | ||||
| Replicates | 4 | 4 | 4 | 4 | 4 | ||||
| Body weight, kg | |||||||||
| Start | 458.3 | 458.1 | 445.7 | 461.1 | 453.9 | 23.5 | 0.96 | 0.80 | 0.62 |
| Final | 669.7 | 671.3 | 663.3 | 653.7 | 665.7 | 19.0 | 0.65 | 0.60 | 0.98 |
| Gain | 211.4 | 213.2 | 217.6 | 192.6 | 211.7 | 19.4 | 0.62 | 0.37 | 0.47 |
| Daily gain, kg/d | 2.03 | 2.05 | 2.09 | 1.85 | 2.04 | 0.17 | 0.52 | 0.27 | 0.33 |
| Daily feed intake4, kg/d | 11.0 | 10.8 | 11.0 | 10.7 | 10.8 | 0.32 | 0.49 | 0.60 | 0.79 |
| Gain:feed4,5 | 0.18 | 0.19 | 0.19 | 0.17 | 0.19 | 0.01 | 0.64 | 0.20 | 0.19 |
1Carbonate (inorganic) vs organic (acetate and lactate).
2Cobalt acetate vs. cobalt lactate.
3Cobalt feeding level of 30 mg/steer/d vs. 60 mg/steer/d.
4On a dry matter basis.
5Gain:feed, kg body weight gain/kg feed intake.